CN204389663U - A kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge - Google Patents
A kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge Download PDFInfo
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- CN204389663U CN204389663U CN201420564955.5U CN201420564955U CN204389663U CN 204389663 U CN204389663 U CN 204389663U CN 201420564955 U CN201420564955 U CN 201420564955U CN 204389663 U CN204389663 U CN 204389663U
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Abstract
The utility model proposes a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge, comprise substrate, stagger arrangement soft magnetism flux concentrator array, and be positioned at and substrate have X to the GMR Spin Valve in magnetic susceptibility direction or TMR magneto-resistor sensing unit array, soft magnetism flux concentrator comprises the limit and four angles that are parallel to X-axis and Y-axis, A is labeled as successively clockwise from top-left position, B, C and D, magneto-resistor sensing unit is gap location between soft magnetism flux concentrator, corresponding soft magnetism flux concentrator A simultaneously, C Angle Position and B, the magneto-resistor sensing unit of D Angle Position is defined as respectively and pushes away magneto-resistor sensing unit and draw magneto-resistor sensing unit, push away magneto-resistor sensing unit to be electrically connected and to be connected into one or more push arm, draw magneto-resistor sensing unit to be electrically connected and to be connected into one or more drawing bow, push arm is connected into push-pull type sensor bridge with drawing bow to be electrically connected.This is novel low in energy consumption, and magnetic field sensitivity is high, can measure Y-direction magnetic field.
Description
Technical field
The utility model relates to magnetic sensor field, particularly a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge.
Background technology
In diaxon and three axle magnetic compass chip design process, need to use X-axis and Y-axis magneto-dependent sensor simultaneously, for the sensing unit of magneto-resistor type, generally there is single responsive magnetic direction, it is such as X-direction magnetic-field-sensitive, for the acquisition of Y-direction magnetic-field-sensitive, general employing is by X-direction magnetic-field-sensitive sensing unit 90-degree rotation, Y-direction magnetic field sensing cell is obtained with this, secondly, in order to improve the magnetic field sensitivity of X or Y-axis magnetic resistance sensor, usual employing push-pull type electric bridge, wherein push arm and bracket adopt the form of discrete manufacture, relatively turnback is revolved relative to another by one of them, such push arm and bracket have contrary pinned layer magnetization direction, and free layer direction of magnetization is identical, the magnetized state schematic diagram of the magneto-resistor sensing unit of fly line pinning layer as Fig. 2 a is, between push arm and the section of bracket, then adopt the form of fly line to connect.
Mainly there are the following problems for Y-axis magnetic resistance sensor set forth above:
1), when preparing X and Y-axis magnetic resistance sensor at grade simultaneously, because X and Y-axis magnetic resistance sensor are all discrete component, therefore cannot realize Integrated manufacture, add the complicacy of technique, and have impact on the measuring accuracy of diaxon or three-axis sensor.
2) push arm and bracket cannot realize the technique of Integrated manufacture, and the technique adopting discrete section fly line to connect, adds the complicacy of technique equally, affects the measuring accuracy of sensor.
Summary of the invention
In order to solve above Problems existing, the utility model proposes a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge and preparation method, flux concentrator is adopted to realize the distortion in the direction to Y magnetic field, obtain the magnetic-field component of-X and X-direction, magneto-resistor sensing units all like this has identical pinned layer magnetization direction, push arm and drawing bow is realized by the rightabout deflection of free layer, and Fig. 2 a is the schematic diagram of the magnetized state of the magnetoresistance cells of such type differential free layer type.
A kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge that the utility model proposes comprises:
Be positioned at the substrate on X-Y plane;
The soft magnetism flux concentrator array of a staggered arrangement;
Described each soft magnetism flux concentrator has the limit being parallel to X-axis and Y-axis, and four angles, and described four angle clockwise direction from top-left position are labeled as A, B, C and D successively;
Be positioned at the magneto-resistor sensing unit array on described substrate, it comprises the magneto-resistor sensing unit of the gap location between described soft magnetism flux concentrator;
Described magneto-resistor sensing unit near A and the C Angle Position being positioned at any soft magnetism flux concentrator is called and pushes away magneto-resistor sensing unit;
Described magneto-resistor sensing unit near B and the D Angle Position being positioned at any soft magnetism flux concentrator is called draws magneto-resistor sensing unit;
Push away magneto-resistor sensing unit described in all to be electrically connected and to be connected into one or more push arm;
Draw magneto-resistor sensing unit described in all to be electrically connected and to be connected into one or more drawing bow;
All described push arms and all described in draw bow to be electrically connected and be connected into a push-pull type sensor bridge.
Preferably, described magneto-resistor sensing unit is GMR Spin Valve or TMR sensing unit, during without external magnetic field, the pinned layer magnetization direction of all described magneto-resistor sensing units is identical and be parallel to Y direction, and the free layer direction of magnetization of all described magneto-resistor sensing units is identical and be parallel to X-direction.
Preferably, the soft magnetism flux concentrator array of described staggered arrangement comprises the first soft magnetism flux concentrator and the second soft magnetism flux concentrator, described first soft magnetism flux concentrator and described second soft magnetism flux concentrator are all arranged in the row that are parallel to described Y direction and are parallel to the row of described X-direction, described soft magnetism flux concentrator is Ly at described Y direction yardstick and is Lx at described X-direction yardstick, gap along described Y direction between described first soft magnetism flux concentrator and described second soft magnetism flux concentrator adjacent row is separately yGap, and the row of described second soft magnetism flux concentrator are ± (Ly+yGap)/2 relative to the row of described first soft magnetism flux concentrator along the distance of described Y direction relative movement.
Preferably, the line direction of described magneto-resistor sensing unit array is parallel to described X-direction and column direction is parallel to described Y direction, the row of described magneto-resistor sensing unit array are positioned at the gap center of described first soft magnetism flux concentrator and the second soft magnetism flux concentrator adjacent column, push away angle A and C position, angle that magneto-resistor sensing unit distinguishes corresponding first and second soft magnetism flux concentrators simultaneously, and described second soft magnetism flux concentrator has positive Y-axis displacement relative to described first soft magnetism flux concentrator, describedly draw magneto-resistor sensing unit respectively the angle B of corresponding first and second soft magnetism flux concentrators and D position, angle simultaneously, and described second soft magnetism flux concentrator has the equivalent displacement of negative Y-axis relative to the first soft magnetism flux concentrator.
Preferably, described magneto-resistor sensing unit array often row and often row by be alternately arranged push away magneto-resistor sensing unit and draw magneto-resistor sensing unit composition.
Preferably, the often row of described magneto-resistor sensing unit array comprise be alternately arranged push away magneto-resistor sensing unit and draw magneto-resistor sensing unit, described magneto-resistor sensing unit array comprises pushing away of being alternately arranged, and magneto-resistor sensing unit is capable and to draw magneto-resistor sensing unit capable, describedly push away that magneto-resistor sensing unit is capable to be formed by pushing away magneto-resistor sensing unit, described in draw that magneto-resistor sensing unit is capable to be formed by drawing magneto-resistor sensing unit.
Preferably, the often row of described magneto-resistor sensing unit array comprise be alternately arranged push away magneto-resistor sensing unit and draw magneto-resistor sensing unit, the pushing away magneto-resistor sensing unit row and drawing magneto-resistor sensing unit of being alternately arranged that be classified as of described magnetoresistance cells array arranges, the described magneto-resistor sensing unit that pushes away arranges and forms by pushing away magneto-resistor sensing unit, described in draw magneto-resistor sensing unit and arrange and form by drawing magneto-resistor sensing unit.
Preferably, the bias voltage of described push-pull type magnetic field sensor electric bridge, ground and signal output part are electrically connected to the pad being positioned at described substrate face or the pad being connected to described substrate back by TSV.
Preferably, during without external magnetic field, described magneto-resistor sensing unit is by permanent magnet bias, and at least one mode in double exchange model, shape anisotropy makes the direction of magnetization of the free magnetic layer of described magneto-resistor sensing unit vertical with the direction of magnetization of pinned magnetic layer.
Preferably, described push arm is identical with the quantity of the magneto-resistor sensing unit on described drawing bow.
Preferably, described push arm is identical relative to the amplitude of the anglec of rotation of the direction of magnetization of respective pinning layer with the free layer of the magneto-resistor sensing unit on described drawing bow and direction is contrary.
Preferably, described push-pull type magnetic field sensor electric bridge is half-bridge, full-bridge or accurate bridge.
Preferably, the material of described substrate is glass or silicon chip, and described substrate is connected with other asic chip containing asic chip or described substrate.
Preferably, described soft magnetism flux concentrator for comprising Fe, one or more the alloy soft magnetic material in Ni or Co element.
Preferably, single-chip difference free layer push-pull type magnetic field sensor electric bridge also comprises test coil, described test coil to be positioned at directly over described magneto-resistor sensing unit or immediately below, the direction of current of described test coil is parallel to described Y direction, and pushes away described in flowing through during test that magneto-resistor sensing unit is contrary with the described direction of current drawing the respectively corresponding described test coil of magneto-resistor sensing unit and size is identical.
Preferably, single-chip difference free layer push-pull type magnetic field sensor electric bridge also comprises replacement coil, described replacement coil to be positioned at immediately below described magneto-resistor sensing unit or directly over, the direction of current of described replacement coil is parallel to described X-direction, and the size of current pushing away the magneto-resistor sensing unit described replacement coil respectively corresponding with drawing magneto-resistor sensing unit described in flowing through is identical and direction is identical.
Accompanying drawing explanation
Fig. 1 push-pull type magnetic resistance sensor bridge structure figure;
Fig. 2 a, 2b are respectively upset pinning layer, difference free layer push-pull type magnetic resistance sensor magnetized state figure;
Fig. 3 soft magnetism flux concentrator Y-direction characteristics of geomagnetic field distribution and magneto-resistor sensing unit relative position figure;
Fig. 4 single-chip difference free layer push-pull type magnetic resistance sensor Y-direction magnetic-field measurement figure;
Fig. 5 single-chip difference free layer push-pull type magnetic resistance sensor X is to magnetic-field measurement figure;
Fig. 6 single-chip difference free layer push-pull type magnetic resistance sensor structure one figure;
Fig. 7 single-chip difference free layer push-pull type magnetic resistance sensor structure two figure;
Fig. 8 single-chip difference free layer push-pull type magnetic resistance sensor structure one Y-direction magnetic-field measurement figure;
X is to magnetic-field measurement figure for Fig. 9 single-chip difference free layer push-pull type magnetic resistance sensor structure one;
Figure 10 single-chip difference free layer push-pull type magnetic resistance sensor structure one sensing station Y-direction Distribution of Magnetic Field figure;
Figure 11 single-chip difference free layer push-pull type magnetic resistance sensor structure one sensing station X is to Distribution of Magnetic Field figure;
Figure 12 single-chip difference free layer push-pull type magnetic resistance sensor structure one electric bridge connection layout;
Figure 13 single-chip difference free layer push-pull type magnetic resistance sensor structure one test coil layout viewing;
Figure 14 single-chip difference free layer push-pull type magnetic resistance sensor structure one resets coil configuration figure;
The each Rotating fields figure of Figure 15 single-chip difference free layer push-pull type magnetic resistance sensor;
The each Rotating fields figure of single-chip difference free layer push-pull type magnetic resistance sensor of Figure 16 tape test and replacement coil;
The each Rotating fields figure of Figure 17 TSV single-chip difference free layer push-pull type magnetic resistance sensor;
The each Rotating fields of single-chip difference free layer push-pull type magnetic resistance sensor of Figure 18 TSV tape test and replacement coil;
The micro-flow chart making of Figure 19 single-chip difference free layer push-pull type magnetic resistance sensor;
The micro-flow chart making of Figure 20 TSV single-chip difference free layer push-pull type magnetic resistance sensor.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
Embodiment one
Fig. 1 is the full bridge structure figure of push-pull type magnetic resistance sensor, comprise R1, R2, R3 and R4 tetra-brachium pontis, wherein R1 and R4 is push arm, R2 and R3 for drawing bow, for magnetic resistance sensor, push arm and draw bow with under external magnetic field, there is opposite magnetic fields variation characteristic, for the magneto-resistor sensing unit of GMR Spin Valve and TMR type, mean that the angle in free layer and pinned layer magnetization direction increases (reduction) respectively and reduces (increases), and the amplitude changed is identical.
Fig. 2 a, 2b are two kinds of possibility situations of the magnetized state in the push-pull type magnetic resistance sensor of GMR Spin Valve or TMR type, it is the situation of upset pinning layer in Fig. 2 b, wherein push arm magneto-resistor sensing unit is contrary with the direction of magnetization of pinning layer in magneto-resistor sensing unit of drawing bow, and free layer direction of magnetization is identical.Like this, when external magnetic field, although identical change occurs their free layer direction of magnetization, because pinned layer magnetization direction is contrary, thus, both are contrary relative to the variable angle of pinning layer.Upset pinning layer in Fig. 2 b is modal push-pull type magnetic resistance sensor structure, and its implementation is the section section upset 180 comprising push arm being obtained drawing bow, and then both is connected by fly line, is jointly encapsulated in same chip.
The situation of difference free layer for the utility model proposes in Fig. 2 a, wherein push arm magneto-resistor sensing unit is identical with the direction of magnetization of pinning layer in magneto-resistor sensing unit of drawing bow, but under same external magnetic field, utilize the effect of magnetic circuit, make the magnetic direction acting on push arm and free layer of drawing bow contrary, like this under same external magnetic field, thus make the angle between free layer direction of magnetization and pinned layer magnetization direction equally inverse change occur, because the pinning layer of push arm magneto-resistor sensing unit and magneto-resistor sensing unit of drawing bow is identical with the magnetized state of free layer, therefore can Integrated manufacture in same section.
Embodiment two
Fig. 3 be the utility model proposes utilize soft magnetism flux concentrator same Y-direction to be measured external magnetic field H to be transformed into pushing away magneto-resistor sensing unit and drawing the location drawing of magneto-resistor sensing unit of the Distribution of Magnetic Field with contrary two X component magnetic field and correspondence.Wherein soft magnetism flux concentrator 1 has the limit being parallel to X and Y-axis, and there are four angles, A is labeled as successively along clockwise direction from upper left, B, C and D, Y-direction external magnetic field H is after flux concentrator 1, magnetic field produces distortion near flux concentrator 1, except Y magnetic-field component, have also appeared X magnetic-field component, magnetic field wherein near Angle Position D and Angle Position B has positive X magnetic-field component, the magnetic field be positioned near Angle Position A and Angle Position C has negative X magnetic-field component, therefore the magneto-resistor sensing unit 31 and 33 be positioned near angle A and C position, angle is defined as and pushes away magneto-resistor sensing unit, the magneto-resistor sensing unit 32 and 34 be positioned near angle B and D position, angle is defined as draws magneto-resistor sensing unit, 31, 32, the pinning layer direction of 33 and 34 4 magneto-resistor sensing units is X-direction, free layer direction of magnetization is Y-direction.The embodiment of the present application discloses a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge, comprising:
Be positioned at the substrate on X-Y plane; The soft magnetism flux concentrator array of a staggered arrangement, its each soft magnetism flux concentrator has the limit being parallel to X-axis and Y-axis, and four angles, and four angles are labeled as A, B, C and D successively; Be positioned at the magneto-resistor sensing unit array on substrate, it comprises the magneto-resistor sensing unit of the gap location between described soft magnetism flux concentrator; Described magneto-resistor sensing unit near A and the C Angle Position being positioned at any soft magnetism flux concentrator is called and pushes away magneto-resistor sensing unit; Described magneto-resistor sensing unit near B and the D Angle Position being positioned at any soft magnetism flux concentrator is called draws magneto-resistor sensing unit, push away magneto-resistor sensing unit described in all to be electrically connected and to be connected into one or more push arm, all magneto-resistor sensing units of drawing are electrically connected and are connected into one or more drawing bow; All described push arms and all described in draw bow to be electrically connected and be connected into a push-pull type sensor bridge.
The soft magnetism flux concentrator array of an above-mentioned staggered arrangement is made up of two soft magnetism flux concentrator arrays, the soft magnetism flux concentrator Heterogeneous Permutation of two soft magnetism flux concentrator arrays, makes can form a flux circuit between the soft magnetism flux concentrator of two soft magnetism flux concentrator arrays.The following provide several concrete structure.
Embodiment three
The structural drawing of the single-chip difference free layer push-pull type magnetic resistance sensor that Fig. 4 and Fig. 5 proposes for the utility model and the measuring principle figure to X and Y-direction external magnetic field thereof, comprise the substrate be positioned on X-Y plane, by 11 i.e. first and 12 i.e. the second two soft magnetism flux concentrator arrays that the mutual stagger arrangement of soft magnetism flux concentrator array is formed, and by pushing away magneto-resistor sensing unit unit and drawing the magnetic resistance sensor array 35 that magneto-resistor sensing unit forms.Described soft magnetism amount concentrator array row direction is parallel to X-axis, column direction is parallel to Y-axis, its Y-direction gap is ygap, X-direction gap is xgap and rgap, namely along X positive dirction, the first row of the first soft magnetism flux concentrator and the X-direction gap of the second adjacent soft magnetism flux concentrator first row are xgap, and the X-direction gap of the secondary series of the first row of the second soft magnetism flux concentrator and the first soft magnetism flux concentrator is rgap, in the present embodiment, xgap and rgap has identical numerical value, soft magnetism flux concentrator Y-direction yardstick is Ly, X-direction yardstick is Lx, wherein 11 and 12 soft magnetism flux concentrators row between along Y-direction relative movement plus or minus (Ly+ygap)/2 distance, magnetic resistance sensor array 35 is positioned at the gap location of 11 and 12 soft magnetism flux concentrators, its line direction is parallel to X-direction, column direction is parallel to Y-direction, wherein push away magneto-resistor sensing unit is positioned near angle A and angle C simultaneously, draw magneto-resistor sensing unit is positioned near angle B and angle D simultaneously, the described magneto-resistor sensing unit that pushes away is electrically connected and is connected into one or more push arm, described magneto-resistor sensing unit of drawing is electrically connected and is connected into one or more drawing bow, described push arm and be electrically connected between drawing bow and be connected into push-pull type magnetic resistance sensor electric bridge.In said structure, D, A of B, C of the soft magnetism amount concentrator of first row the first row and the soft magnetism amount concentrator of first, second row of secondary series form a continuous print magnetic flux path.
Fig. 4 also gives in the Y direction under magnetic fields simultaneously, the direction of the sensitive direction magnetic-field component of described magnetic resistance sensor position, according to Fig. 2 a, the described magneto-resistor sensing unit that pushes away has contrary magnetic direction with the direction of drawing magneto-resistor sensing unit free layer relative to the direction of their pinning layer, shows effectively to measure Y-direction magnetic field.
Fig. 5 is under X-direction magnetic fields, the direction of the responsive magnetic direction magnetic-field component of described magnetic resistance sensor position, according to Fig. 2 a, can find out, push away magneto-resistor sensing unit and relative to the direction of their pinning layer, there is identical magnetic direction with the direction of drawing magneto-resistor sensing unit free layer, now push arm has identical resistance variations with drawing bow, and therefore push-pull type magnetic resistance sensor electric bridge exports is 0.Therefore, Fig. 4 and Fig. 5 shows, the magnetic-field-sensitive direction of described single-chip difference free layer push-pull type magnetic resistance sensor is Y-direction, is a kind of Y-axis magnetic field sensor.
Embodiment four
Fig. 6 is structure one figure of single-chip difference free layer push-pull type magnetic resistance sensor, it is actually a kind of special case in Fig. 4 and Fig. 5, it is characterized in that, described magnetic resistance sensor Y-direction often arranges and pushes away magneto-resistor sensing unit by what be alternately arranged and draw magneto-resistor sensing unit composition, X-direction is often capable then complete to be formed by pushing away magneto-resistor sensing unit or drawing magneto-resistor sensing unit, and push away magneto-resistor row 35 and draw magneto-resistor row 36 and be alternately arranged, now xgap with rgap can not be identical, in the present embodiment, xgap is less than rgap, to ensure that magnetic field focuses on the xgap place at magneto-resistor sensing unit place as much as possible.
Embodiment five
Fig. 7 is structure two figure of single-chip difference free layer push-pull type magnetic resistance sensor, its reality is also the another kind of special case in Fig. 4 and Fig. 5, it is characterized in that, described magnetic resistance sensor X-direction often row pushes away magneto-resistor sensing unit by what be alternately arranged and draw magneto-resistor sensing unit composition, Y-direction often arranges, and completely forms by pushing away magneto-resistor sensing unit or drawing magneto-resistor sensing unit, and push away magneto-resistor sensing unit row 37 and draw magneto-resistor sensing unit row 38 and be alternately arranged, now xgap equals rgap, has identical magnetic field intensity to guarantee that magnetic resistance sensor is capable.
Embodiment six
Fig. 8 and Figure 10 be described single-chip difference free layer push-pull type magnetic field sensor to Y measurement of magnetic field time, described magnetic resistance sensor array respectively arranges the X of No.1 ~ No.5 along Y-direction to magnetic-field component distribution plan, 8 magneto-resistor sensing units in figure in the corresponding often row of n1 ~ n8 difference, comprise 4 push away magneto-resistor sensing unit and 4 draw magneto-resistor sensing unit, as can be seen from Figure 10, described pushing away magneto-resistor sensing unit and draw magneto-resistor sensing unit position has contrary X to magnetic direction, in addition, amplitude is also more or less the same, thus forms push-pull type electric bridge.
Fig. 9 and Figure 11 be described single-chip difference free layer push-pull type magnetic field sensor to X measurement of magnetic field time, the each row No.1 ~ No.5 of described magnetic resistance sensor array is along the X of Y-direction to magnetic-field component distribution plan, as can be seen from Figure 11, m1 ~ m8 magneto-resistor sensing unit in corresponding often row, there is identical X to magnetic direction, show, this structure electric bridge can not produce response to X to magnetic field.
Embodiment seven
Figure 12 is the electrical connection graph of the single-chip difference free layer push-pull type magnetic resistance sensor corresponding to structure one, can find out, described push away magneto-resistor sensing unit and draw magneto-resistor sensing unit be electrically connected and be connected into push arm and drawing bow, push arm and draw bow to be electrically connected by conductor metal 41 and be connected into the push-pull type magnetic resistance sensor electric bridge of a full bridge structure, and be connected respectively to bias electrode 8, ground electrode 7, export input electrode 5 and 6, described push-pull type electric bridge, except full-bridge, can also be half-bridge or accurate bridge type.
Embodiment eight
Figure 13 is under described single-chip difference free layer push-pull type magnetic field sensor comprises test coil situation, the distribution plan of test coil on chip, wherein test coil comprises 91 and 92 two sections, and lay respectively at and push away magneto-resistor sensing unit and draw on magneto-resistor sensing unit, and the direction that electric current flows through is Y-direction, and direction is contrary, test coil adopts meanderer geometry, parallel to ensure the flowing through test coil section pushed away above magneto-resistor sensing unit, flow through the test coil section of drawing above magneto-resistor sensing unit to be also parallel to each other, when passing through electric current in test coil, because 91 is identical with 92 sections of size of current, direction is contrary, 91 sections are pushing away magneto-resistor sensing unit place generation X to magnetic field H1, drawing magneto-resistor sensing unit place generation-X to magnetic field-H1 for 92 sections, and size is identical, and magnetic field size is proportional to flow through electric current I, like this, when adopting the electric current I flowing through test coil namely can emulate external magnetic field along Y-direction, external magnetic field is being pushed away magneto-resistor sensing unit by soft magnetism flux concentrator and is being drawn the magnetic field that magneto-resistor sensing unit place produces, like this, can be calibrated single-chip difference free layer push-pull type magnetic field sensor by test coil, namely by certain electric current, in the case, the change of direct measurement chip output signal, if output voltage within the specific limits, then this chip is chip good for use, if not in scope, then this chip is defective chip.
Embodiment nine
Figure 14 is under described single-chip difference free layer push-pull type magnetic field sensor comprises replacement (Reset) coil 93 situation, reset the distribution plan of coil 93 on chip, can find out, resetting coil 93 is meander-shaped, comprise respectively by push away magneto-resistor sensing unit and draw magneto-resistor sensing unit composition row above straight-line segment, and straight-line segment is parallel to X-direction, and direction of current is consistent.The object resetting coil 93 is, when single-chip difference free layer push-pull type magnetic field sensor is positioned in high-intensity magnetic field, due to the moving process of the irreversible domain wall that the magnetic domain comprised in free layer occurs in magnetic history, large magnetic hysteresis is there is under causing the effect of free layer outside magnetic field, deviate from the test curve of original standard, in this case, resetting the current field direction that coil 93 produces is Y-direction pushing away magneto-resistor sensing unit and drawing the magnetic field that magneto-resistor sensing unit place produces, now, because pinned layer magnetization direction is X-direction, free layer direction of magnetization is Y-direction, the cyclical variation of the electric current in coil is reset by adjustment, the cyclical variation in the Y magnetic field produced, the direction of magnetization of free layer and magnetized state are adjusted to rational state, thus make single-chip difference free layer push-pull type magnetic field sensor recover normal work.
Embodiment ten
Figure 15 and Figure 16 is respectively single-chip difference free layer push-pull type magnetic field sensor and does not comprise and comprise test coil and the chip cross-section figure reset in coil situation, substrate 4 is followed successively by from top to bottom in Figure 15, be positioned at the magnetic resistance sensor 3 on substrate 4, comprise Seed Layer and bottom conductive electrode 310, multilayered film material stack of layers 311, and the insulation course 600 of landfill multilayered film material stack of layers 311, top layer conductive electrode 312; In addition, the insulation course 410 between top layer conductive electrode 312 and soft magnetism flux concentrator 1; In addition, be positioned at the passivation layer 500 on top layer electrode 312 on soft magnetism flux concentrator 1 in addition, and be positioned at the pad 700 on top layer electrode layer 410.
In Figure 16, difference is, reset coil 93 to be positioned on substrate 4, and adopt 911 insulation courses to isolate between replacement coil 93 and bottom electrode 310, in addition, test coil comprises and is positioned at 91 and 92 on magneto-resistor sensing unit 3, has contrary direction of current respectively.
More than for adopting the form of chip front side pad, reality also comprises employing TSV (Through Silicon Vias, by silicon chip passage) situation of backside pads, as shown in Figure 17 and Figure 18, difference is, comprises TSV copper column 800 and pad 900 that one is positioned at substrate 4 back side.
Embodiment 11
Figure 19 corresponds to the flow chart making that pad is positioned at the single-chip difference free layer push-pull type magnetic field sensor of chip front side: comprise the steps
1) blank level and smooth wafer 4;
2) deposit at crystal column surface and build replacement coil-conductor 93;
3) at replacement coil-conductor surface deposition first insulation course 911;
4) in the first surface of insulating layer deposited seed layer and bottom electrode 310 magneto-resistor multilayered film material stack of layers 311;
5) magnetic anneal is to obtain the direction of magnetization of magneto-resistor multilayered film material pinning layer;
6) related process is adopted to build the pattern of bottom electrode 310 and magneto-resistor sensing unit 311;
7) at magneto-resistor sensing unit disposed thereon second insulation course 600, and special process is adopted to carry out through hole to the second insulation course 600, to spill the magneto-resistor multilayered film material stack layer of corresponding top layer electrode;
8) build top layer electrode 312 and connect up;
9) at top layer electrode disposed thereon the 3rd insulation course 410;
10) test coil conductor 91 and 92 is built at the 3rd insulation course disposed thereon;
11) soft magnetism flux concentrator 1 is built at the 3rd insulation course disposed thereon;
12) at soft magnetism flux concentrator disposed thereon passivation layer 500;
13) adopt specific processing technology to dispose passivation layer for the formation of welding disking area, and form pad 700.
When substrate back is positioned at for employing TSV technique pad, then adopt procedure of processing as shown in figure 20:
1) by DRIE technique shaping TSV deep hole on the substrate 4;
2) in TSV deep hole, TSV Cu post 800 is electroplated;
3) the smooth described plating TSV Cu post 800 exceeding described substrate surface;
4) deposition is also graphical resets coil-conductor 93, and makes its electrode I/O be connected (optional) with TSV Cu post 800;
5) described replacement coil-conductor 93 surface deposition one deck first insulation course 911 (optional);
6) described first insulation course 911 window is etched, and at the stack layer of described first insulation course 911 surface deposition magneto-resistance film material 311, bottom electrode 310 position is connected with the Cu post 800 of etching window, and the direction of magnetization of magneto-resistance film material 311 pinning layer is set;
7) bottom electrode 310 is built, and the pattern by using related process to build magneto-resistor sensing unit on magneto-resistance film material 311;
8) at magneto-resistor sensing unit disposed thereon one second insulation course 600, and the through hole carrying out with magneto-resistor sensing unit 311 being electrically connected is formed by related process;
9) at disposed thereon one top layer metallic layer 312 of through hole, form top layer electrode by related process, and connect up between each magneto-resistor sensing unit;
10) at described top layer metallic layer 312 disposed thereon 1 the 3rd insulation course 410, open insulation course window, again at the 3rd insulation course disposed thereon also graphical test coil conductor 91 and 92, its input and output electrode is made to be connected (optional) with Cu post 800;
11) at the 3rd insulation course 410 disposed thereon soft magnetism flux concentrator 1;
12) at soft magnetism flux concentrator 1 disposed thereon passivation layer 500;
13) substrate 4 thinning back side, described Cu post 800 spills;
14) shaping TSV pad 900, and TSV pad is connected with TSV Cu post 800;
The insulating material of described depositing insulating layer can be aluminium oxide, silicon nitride, monox, polyimide and photoresist.
The material of described formation passivation layer is DLC, silicon nitride, aluminium oxide and gold.
By carrying out the direction of magnetization that high annealing arranges the pinning layer in described magneto-resistance film material in magnetic field;
Described related process in step comprises photoetching, ion etching, reactive ion etching, wet etching, peels off or hard mask;
Described through hole in step is self-aligned contact hole, and described self-aligned contact hole, by carrying out lift-off processing to be formed to described magneto-resistance film material, is formed by using ion etch process or logical hard mask and CMP (Chemical Mechanical Polishing) process.
Claims (16)
1. a single-chip difference free layer push-pull type magnetic field sensor electric bridge, is characterized in that, comprising:
Be positioned at the substrate on X-Y plane;
The soft magnetism flux concentrator array of a staggered arrangement, its each soft magnetism flux concentrator has the limit being parallel to X-axis and Y-axis, and four angles, and described four angle clockwise direction from top-left position are labeled as A, B, C and D successively;
Be positioned at the magneto-resistor sensing unit array on described substrate, it comprises the magneto-resistor sensing unit of the gap location between described soft magnetism flux concentrator;
Described magneto-resistor sensing unit near A and the C Angle Position being positioned at any soft magnetism flux concentrator is called and pushes away magneto-resistor sensing unit;
Described magneto-resistor sensing unit near B and the D Angle Position being positioned at any soft magnetism flux concentrator is called draws magneto-resistor sensing unit;
Push away magneto-resistor sensing unit described in all to be electrically connected and to be connected into one or more push arm;
Draw magneto-resistor sensing unit described in all to be electrically connected and to be connected into one or more drawing bow;
All described push arms and all described in draw bow to be electrically connected and be connected into a push-pull type sensor bridge.
2. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge according to claim 1, it is characterized in that, described magneto-resistor sensing unit is GMR Spin Valve or TMR sensing unit, during without external magnetic field, the pinned layer magnetization direction of all described magneto-resistor sensing units is identical and be parallel to Y direction, and the free layer direction of magnetization of all described magneto-resistor sensing units is identical and be parallel to X-direction.
3. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge according to claim 1, it is characterized in that, the soft magnetism flux concentrator array of described staggered arrangement comprises the first soft magnetism flux concentrator and the second soft magnetism flux concentrator, described first soft magnetism flux concentrator and described second soft magnetism flux concentrator are all arranged in the row that are parallel to described Y direction and are parallel to the row of described X-direction, described soft magnetism flux concentrator is Ly at described Y direction yardstick and is Lx at described X-direction yardstick, gap along described Y direction between described first soft magnetism flux concentrator and described second soft magnetism flux concentrator adjacent row is separately yGap, and the row of described second soft magnetism flux concentrator are ± (Ly+yGap)/2 relative to the row of described first soft magnetism flux concentrator along the distance of described Y direction relative movement.
4. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge according to claim 3, it is characterized in that, the line direction of described magneto-resistor sensing unit array is parallel to described X-direction and column direction is parallel to described Y direction, the row of described magneto-resistor sensing unit array are positioned at the gap center of described first soft magnetism flux concentrator and the second soft magnetism flux concentrator adjacent column, push away angle A and C position, angle that magneto-resistor sensing unit distinguishes corresponding first and second soft magnetism flux concentrators simultaneously, and described second soft magnetism flux concentrator has positive Y-axis displacement relative to described first soft magnetism flux concentrator, describedly draw magneto-resistor sensing unit respectively the angle B of corresponding first and second soft magnetism flux concentrators and D position, angle simultaneously, and described second soft magnetism flux concentrator has the equivalent displacement of negative Y-axis relative to the first soft magnetism flux concentrator.
5. according to claim 1, a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge described in 3 or 4, it is characterized in that, described magneto-resistor sensing unit array often row and often row by be alternately arranged push away magneto-resistor sensing unit and draw magneto-resistor sensing unit composition.
6. according to claim 1, a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge described in 3 or 4, it is characterized in that, the often row of described magneto-resistor sensing unit array comprise be alternately arranged push away magneto-resistor sensing unit and draw magneto-resistor sensing unit, described magneto-resistor sensing unit array comprises pushing away of being alternately arranged, and magneto-resistor sensing unit is capable and to draw magneto-resistor sensing unit capable, describedly push away that magneto-resistor sensing unit is capable to be formed by pushing away magneto-resistor sensing unit, described in draw that magneto-resistor sensing unit is capable to be formed by drawing magneto-resistor sensing unit.
7. according to claim 1, a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge described in 3 or 4, it is characterized in that, the often row of described magneto-resistor sensing unit array comprise be alternately arranged push away magneto-resistor sensing unit and draw magneto-resistor sensing unit, the pushing away magneto-resistor sensing unit row and drawing magneto-resistor sensing unit of being alternately arranged that be classified as of described magnetoresistance cells array arranges, the described magneto-resistor sensing unit that pushes away arranges and forms by pushing away magneto-resistor sensing unit, described in draw magneto-resistor sensing unit and arrange and form by drawing magneto-resistor sensing unit.
8. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge according to claim 1, it is characterized in that, the bias voltage of described push-pull type magnetic field sensor electric bridge, ground and signal output part are electrically connected to the pad being positioned at described substrate face or the pad being connected to described substrate back by TSV.
9. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge according to claim 1, it is characterized in that, during without external magnetic field, described magneto-resistor sensing unit is by permanent magnet bias, and at least one mode in double exchange model, shape anisotropy makes the direction of magnetization of the free magnetic layer of described magneto-resistor sensing unit vertical with the direction of magnetization of pinned magnetic layer.
10. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge according to claim 1, it is characterized in that, described push arm is identical with the quantity of the magneto-resistor sensing unit on described drawing bow.
11. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridges according to claim 1 and 2, it is characterized in that, described push arm is identical relative to the amplitude of the anglec of rotation of the direction of magnetization of respective pinning layer with the free layer of the magneto-resistor sensing unit on described drawing bow and direction is contrary.
12. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridges according to claim 1, it is characterized in that, described push-pull type magnetic field sensor electric bridge is half-bridge, full-bridge or accurate bridge.
13. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridges according to claim 1, it is characterized in that, the material of described substrate is glass or silicon chip, and described substrate is connected with other asic chip containing asic chip or described substrate.
14. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridges according to claim 1, is characterized in that, described soft magnetism flux concentrator for comprising Fe, one or more the alloy soft magnetic material in Ni or Co element.
15. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridges according to claim 1, it is characterized in that, also comprise test coil, described test coil to be positioned at directly over described magneto-resistor sensing unit or immediately below, the direction of current of described test coil is parallel to described Y direction, and pushes away described in flowing through during test that magneto-resistor sensing unit is contrary with the described direction of current drawing the respectively corresponding described test coil of magneto-resistor sensing unit and size is identical.
16. a kind of single-chip difference free layer push-pull type magnetic field sensor electric bridges according to claim 1, it is characterized in that, also comprise replacement coil, described replacement coil to be positioned at immediately below described magneto-resistor sensing unit or directly over, the direction of current of described replacement coil is parallel to described X-direction, and the size of current pushing away the magneto-resistor sensing unit described replacement coil respectively corresponding with drawing magneto-resistor sensing unit described in flowing through is identical and direction is identical.
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| CN104280700A (en) * | 2014-09-28 | 2015-01-14 | 江苏多维科技有限公司 | Single chip difference free layer push-pull type magnetic field sensor electric bridge and preparation method thereof |
| CN106871778A (en) * | 2017-02-23 | 2017-06-20 | 江苏多维科技有限公司 | A kind of single-chip twin shaft magneto-resistor angular transducer |
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| CN104280700A (en) * | 2014-09-28 | 2015-01-14 | 江苏多维科技有限公司 | Single chip difference free layer push-pull type magnetic field sensor electric bridge and preparation method thereof |
| WO2016045614A1 (en) * | 2014-09-28 | 2016-03-31 | 江苏多维科技有限公司 | Single-chip differential free layer push-pull magnetic field sensor bridge and preparation method |
| CN104280700B (en) * | 2014-09-28 | 2017-09-08 | 江苏多维科技有限公司 | A kind of single-chip difference free layer push-pull type magnetic field sensor electric bridge and preparation method |
| US10066940B2 (en) | 2014-09-28 | 2018-09-04 | MultiDimension Technology Co., Ltd. | Single-chip differential free layer push-pull magnetic field sensor bridge and preparation method |
| CN106871778A (en) * | 2017-02-23 | 2017-06-20 | 江苏多维科技有限公司 | A kind of single-chip twin shaft magneto-resistor angular transducer |
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| CN106871778B (en) * | 2017-02-23 | 2019-11-22 | 江苏多维科技有限公司 | A kind of single-chip twin shaft magneto-resistor angular transducer |
| US11512939B2 (en) * | 2017-02-23 | 2022-11-29 | MultiDimension Technology Co., Ltd. | Single-chip double-axis magnetoresistive angle sensor |
| CN110320482A (en) * | 2019-07-23 | 2019-10-11 | 珠海多创科技有限公司 | A kind of TMR full-bridge Magnetic Sensor and preparation method thereof |
| CN113030804A (en) * | 2021-03-01 | 2021-06-25 | 歌尔微电子股份有限公司 | Sensor and electronic device |
| CN113030804B (en) * | 2021-03-01 | 2022-12-23 | 歌尔微电子股份有限公司 | Sensor and electronic device |
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