WO2004034469A1 - 強磁性トンネル接合素子を用いた磁気記憶装置 - Google Patents
強磁性トンネル接合素子を用いた磁気記憶装置 Download PDFInfo
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- WO2004034469A1 WO2004034469A1 PCT/JP2003/011939 JP0311939W WO2004034469A1 WO 2004034469 A1 WO2004034469 A1 WO 2004034469A1 JP 0311939 W JP0311939 W JP 0311939W WO 2004034469 A1 WO2004034469 A1 WO 2004034469A1
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- Prior art keywords
- tunnel junction
- ferromagnetic tunnel
- junction element
- write
- wiring
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- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 194
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 161
- 238000003860 storage Methods 0.000 title claims abstract description 79
- 238000004804 winding Methods 0.000 claims abstract description 19
- 230000000295 complement effect Effects 0.000 claims abstract description 11
- 239000004065 semiconductor Substances 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 230000005415 magnetization Effects 0.000 claims description 94
- 230000004888 barrier function Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000008094 contradictory effect Effects 0.000 description 4
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910003321 CoFe Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000001447 compensatory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B61/00—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
- H01L27/105—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration including field-effect components
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/10—Magnetoresistive devices
Definitions
- the present invention relates to a magnetic storage device using a ferromagnetic tunnel junction device.
- a ferromagnetic tunnel junction device formed by laminating a magnetic layer via a tunnel barrier layer has attracted attention.
- the resistance value at the tunnel barrier layer becomes lower than a predetermined resistance value (this On the other hand, when the free magnetic layer is magnetized in the opposite direction (anti-parallel direction) to the magnetization direction of the fixed magnetic layer, the resistance value in the tunnel barrier layer is higher than a predetermined resistance value. (This is called the high resistance state).
- the ferromagnetic tunnel junction device uses the above-mentioned characteristic that the resistance value of the tunnel barrier layer varies depending on the magnetization direction of the free magnetic layer, and makes the free magnetic layer the same as the magnetization direction of the fixed magnetic layer.
- Direction or the free magnetic layer is magnetized in the opposite direction to the magnetization direction of the fixed magnetic layer, thereby forming two different magnetization direction states.
- the two different magnetization direction states are defined as “0” or “
- the data is stored in the ferromagnetic tunnel junction device by corresponding to the data of “1”.
- a magnetic storage device using such a ferromagnetic tunnel junction element as a storage medium determines whether the ferromagnetic tunnel junction element stores one of two types of data, and reads the data from the ferromagnetic tunnel junction element. Is read out, For that purpose, it is necessary to determine whether the ferromagnetic tunnel junction device is in a high resistance state or a low resistance state.
- the first and second ferromagnetic tunnel junction elements have respective structures. By storing the contradictory stored data and comparing the resistance value of the first ferromagnetic tunnel junction device with the resistance value of the second ferromagnetic tunnel junction device, the resistance state of the first ferromagnetic tunnel junction device is determined.
- Such a complementary magnetic storage device uses a pair (two) of ferromagnetic tunnel junction elements of a first ferromagnetic tunnel junction element and a second ferromagnetic tunnel junction element to store one piece of data. It is formed adjacently on the same semiconductor substrate, and at the time of writing, the stored data is written to the first ferromagnetic tunnel junction device, and the second ferromagnetic tunnel junction device conflicts with the first ferromagnetic tunnel junction device. When writing the stored data and then reading the data, the resistance values of these two ferromagnetic tunnel junction devices are compared, and the resistance value of the first ferromagnetic tunnel junction device is changed to the resistance value of the second ferromagnetic tunnel junction device.
- the resistance of the first ferromagnetic tunnel junction element is higher than the resistance value of the second ferromagnetic tunnel junction element. If remote low was as the first ferromagnetic tunnel junction device is determined to be summer low resistance like on purpose (e.g., U.S. Patent No. 6 1 9 1 9 8 9 Pat reference.).
- first and second ferromagnetic tunnel junction elements are formed adjacent to each other on a semiconductor substrate, and a coil-shaped first write wiring is arranged around the first ferromagnetic tunnel junction element. It is conceivable to construct a complementary magnetic storage device by disposing a coil-like second write wiring around the second ferromagnetic tunnel junction element.
- the winding direction of the first write wiring and the second write If the winding direction of the write wiring is set to the same direction, the direction of the write magnetic force generated by energizing the first write wiring and the direction of the write magnetic force generated by energizing the second write wiring also become the same direction. Become.
- the direction of the magnetic force formed outside the first write wiring is the same as the direction of the magnetic force formed outside the second write wiring, and the external magnetic forces interfere with each other.
- the magnitude or direction of the write magnetic force changes, and there is a possibility that stored data cannot be accurately written to the first and second ferromagnetic tunnel junction devices.
- a magnetic shield can be formed between the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element to prevent interference between external magnetic forces.
- a space for forming a magnetic shield between the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element is required, which may increase the size of the magnetic storage device.
- a complementary magnetic storage device that stores mutually opposite storage data in the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element,
- the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element are formed adjacent to each other on a substrate, and a first write wiring is coiled around the first ferromagnetic tunnel junction element.
- a second write wire is wound in a coil shape around the second ferromagnetic tunnel junction element, and the winding direction of the first write wire and the second write wire are The winding directions of the writing wires were reversed.
- the start end of the second write wiring is provided at the end of the first write wiring. This was connected to form a series of wiring for writing.
- the first write wiring and the second write wiring are At the position directly above or directly below the first ferromagnetic tunnel junction device and the second ferromagnetic tunnel junction device, a parallel wiring portion extending in a direction substantially parallel to the magnetization direction of the fixed magnetization layer was formed.
- the first write wiring and the second write wiring are: Above and below the first ferromagnetic tunnel junction device and the second ferromagnetic tunnel junction device, the magnetization directions of the fixed magnetization layers of the first ferromagnetic tunnel junction device and the second ferromagnetic tunnel junction device And an upper and lower write wiring extending in a direction substantially perpendicular to the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element in at least one of the upper and lower write wiring.
- a parallel wiring portion extending in a direction substantially parallel to the magnetization direction of the fixed magnetization layer is provided at a position directly above or directly below the ferromagnetic tunnel junction element.
- FIG. 1 is an explanatory view showing a ferromagnetic tunnel junction device.
- FIG. 2 is a perspective view showing the magnetic storage device according to the first embodiment.
- Fig. 3 is a plan view of the same.
- FIG. 4 is a perspective view showing a magnetic storage device according to a second embodiment.
- FIG. 5 is a plan view of the same. BEST MODE FOR CARRYING OUT THE INVENTION
- the first ferromagnetic tunnel junction device and the second ferromagnetic tunnel junction device are fixed on the same semiconductor substrate.
- the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element are formed adjacent to each other at intervals in the direction perpendicular to the magnetization direction of the magnetization layer. For example, it is a complementary magnetic storage device that stores “0” and “1”).
- the first write wiring is wound in a coil shape around the first ferromagnetic tunnel junction element
- the second write wiring is wound around the second ferromagnetic tunnel junction element.
- the wiring is wound in a coil shape.
- the write magnetic force can be efficiently generated with a small write current. Therefore, even when the magnetic storage device is configured in a complementary type, the power consumption during writing can be reduced.
- the winding direction of the first write wiring and the winding direction of the second write wiring are opposite to each other.
- the memory data opposite to the first and second ferromagnetic tunnel junction elements is written.
- the magnetic field generated when the There is no interference between the magnetic force for magnetizing the free magnetic layer of the junction element and the magnetic force for magnetizing the free magnetic layer of the second ferromagnetic tunnel junction element, and the first and second ferromagnetic tunnel junction elements have no interference. Storage data can be accurately written, and the reliability of the magnetic storage device can be improved.
- the starting end of the second write wiring is connected to the end of the first write wiring to form a series of write wirings, the area occupied by the write wiring is minimized.
- the size of the magnetic storage device can be reduced.
- first write wiring and the second write wiring may have a configuration in which the first ferromagnetic tunnel junction element is located above and below the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element. And upper and lower write wirings extending in a direction substantially perpendicular to the magnetization direction of the fixed magnetic layer of the second ferromagnetic tunnel junction element, and at least one of the upper and lower write wirings At the position immediately above or immediately below the first ferromagnetic tunnel junction device and the second ferromagnetic tunnel junction device, a parallel wiring portion extending in a direction substantially parallel to the magnetization direction of the fixed magnetization layer is provided.
- the direction of the write magnetic force acting on the free magnetic layer is fixed by the action of the magnetic force generated by the write current flowing through the parallel wiring portion extending in a direction substantially parallel to the magnetization direction of the fixed magnetic layer. Since the assist effect can be generated by tilting with respect to the magnetization direction of the magnetic layer, and the magnetization direction of the free magnetic layer can be smoothly changed even with a small write current, the power consumption of the magnetic storage device can be reduced. Can be planned.
- the distance between the parallel wiring portion and the ferromagnetic tunnel junction device is reduced by forming the parallel wiring portion at a position directly above or immediately below the first ferromagnetic tunnel junction device and the second ferromagnetic tunnel junction device. It can be as short as possible, which can increase the assist effect.
- the ferromagnetic tunnel junction device 2 Prior to the description of the magnetic storage device 1 according to the present invention, the structure of the ferromagnetic tunnel junction device 2 will be described. As shown in FIG. 1, the ferromagnetic tunnel junction device 2 has a thin film-shaped fixed magnetization layer 3 and a thin film. Lamination with a free magnetic layer 4 with a tunnel barrier layer 5 It is something.
- the fixed magnetic layer 3 is made of a ferromagnetic material (for example, CoFe), and is always magnetized in a certain direction.
- the free magnetic layer 4 is made of a ferromagnetic material (for example, NiFe), and is magnetized in the same direction (parallel direction) as the magnetization direction of the fixed magnetic layer 3 or in the opposite direction (antiparallel direction).
- the tunnel barrier layer 5 is made of an insulator (for example, A1203).
- the tunnel barrier layer 5 It has a characteristic that the resistance value is higher than a predetermined resistance value, and the free magnetic layer 4 is magnetized in the same direction as the magnetization direction of the fixed magnetic layer 3 or the free magnetic layer 4 is
- a ferromagnetic tunnel junction is formed by forming two states with different magnetization directions depending on whether magnetization is performed in the opposite direction to the magnetization direction, and associating the two states with different magnetization directions with data of “0” or “1”. Data is stored in element 2 It is.
- FIG. 2 and FIG. 3 are diagrams showing the magnetic storage device 1 according to the first embodiment of the present invention.
- the magnetic storage device 1 includes a first ferromagnetic tunnel junction element 7 and a second ferromagnetic tunnel junction element 8 on a surface of the same semiconductor substrate 6 and a first ferromagnetic tunnel junction element 7 and a second ferromagnetic tunnel junction element 7. , 8 are formed adjacent to each other at intervals in the direction perpendicular to the magnetization direction of the fixed magnetic layer 3 (see FIG. 1) (refer to the front and rear directions in FIGS. 2 and 3).
- the first ferromagnetic tunnel junction element 7 and the second ferromagnetic tunnel junction element 8 are complementary storage devices that store mutually opposite storage data (for example, “0” and “1”). It is.
- the first ferromagnetic tunnel junction element 7 and the second ferromagnetic tunnel junction element 8 constitute a storage element 9 for one bit.
- the magnetic storage device 1 is formed by forming storage elements 9 for a plurality of bits on the same semiconductor substrate 6 at intervals in the left and right and up and down directions. For this reason, the description will focus on the storage element 9 for one bit.
- the memory element 9 has a coil-shaped first write wiring 10 formed around the first ferromagnetic tunnel junction element 7 and a second ferromagnetic tunnel junction element 8.
- a second write wire 11 in the form of a coil is formed around the wire, and the start end 13 of the second write wire 11 is connected to the end 12 of the first write wire 10 via the connecting portion 14. Then, a series of write wirings 15 is formed. Further, the winding direction of the first write wiring 10 (clockwise in FIG. 2) and the winding direction of the second write wiring 11 (FIG. 2 Is counterclockwise) and are opposite to each other.
- the first write wiring 10 has a first ferromagnetic tunnel junction above the first ferromagnetic tunnel junction element 7.
- Six upper write wirings 16 extending in a direction substantially perpendicular to the magnetization direction (downward in FIG. 3) of the fixed magnetic layer 3 of the element 7, and a second upper write wiring 16 below the first ferromagnetic tunnel junction element 7.
- the six lower write wirings 17 extending in a direction substantially perpendicular to the magnetization direction of the fixed magnetization layer 3 of the ferromagnetic tunnel junction element 7 (downward in FIG. 3) are connected to the upper write wiring 16 and
- the right and left edges of the lower write wiring 17 are connected via through holes 18 and wound clockwise around the first ferromagnetic tunnel junction element 7 as shown in FIG.
- the configuration is as follows.
- the first write wiring 10 has an orientation substantially parallel to the magnetization direction of the fixed magnetization layer 3 at a position directly below the first ferromagnetic tunnel junction element 7 at the end or the middle of the lower write wiring 17.
- a parallel wiring portion 19 extending to the end is formed.
- the second write wiring 11 is provided above the second ferromagnetic tunnel junction element 8 in the magnetization direction of the fixed magnetization layer 3 of the second ferromagnetic tunnel junction element 8 ( (In Fig. 3, downwards)
- Six upper writes extending in a direction substantially perpendicular to The direction substantially perpendicular to the magnetization direction (downward in FIG. 3) of the fixed wiring layer 3 of the second ferromagnetic tunnel junction element 8 below the second wiring 20 and the second ferromagnetic tunnel junction element 8 6 are connected to the lower write wiring 21 via through holes 22 at the left and right edges of the upper write wiring 20 and the lower write wiring 21 as shown in FIG.
- the coil is wound around the second ferromagnetic tunnel junction element 8 in a counterclockwise direction.
- the second write wiring 11 is disposed at an end or a halfway of the lower write wiring 21 at a position directly below the second ferromagnetic tunnel junction element 8 in a direction substantially parallel to the magnetization direction of the fixed magnetization layer 3.
- a parallel wiring portion 23 is formed to extend.
- connection is made via the connection 14.
- reference numerals 24 and 25 denote read wires connected to the free magnetic layer 4 of the first and second ferromagnetic tunnel junction elements 7 and 8, respectively.
- the magnetic storage device 1 is configured as described above, and by applying a current to the write wiring 15, opposite magnetic forces are generated in the first and second coiled write wirings 10 and 11.
- the magnetic force acts on the free magnetic layer 4 of the first and second ferromagnetic tunnel junction devices 7 and 8, and the free magnetic layer 4 of the first ferromagnetic tunnel junction device 7 and the second ferromagnetic
- the free magnetic layer 4 of the tunnel junction element 8 is magnetized in the opposite direction, whereby the first ferromagnetic tunnel junction element 7 and the second ferromagnetic tunnel junction element 8 store mutually opposite stored data. Can be memorized.
- the first write Of the free magnetic layer 4 of the ferromagnetic tunnel junction device 7 of the first ferromagnetic tunnel junction device 7 (that is, the magnetic force in the direction opposite to the magnetization direction of the fixed magnetic layer 3 of the first ferromagnetic tunnel junction device 7) is Then, the free magnetic layer 4 of the first ferromagnetic tunnel junction element 7 can be magnetized in a direction opposite to the magnetization direction of the fixed magnetic layer 3, while the second write wiring 11 has Apply electricity from section 13 to terminal section 27.
- the magnetic force from the rear to the front with respect to the free magnetic layer 4 of the second ferromagnetic tunnel junction element 8 (that is, the same direction as the magnetization direction of the fixed magnetic layer 3 of the second ferromagnetic tunnel junction element 8)
- the free magnetic layer 4 of the first ferromagnetic tunnel junction element 7 can be magnetized in the same direction as the magnetization direction of the fixed magnetic layer 3.
- the power is supplied from the end 27 to the start 26 of the write wiring 15
- the power is supplied from the end 12 to the start 26 in the first write wiring 10.
- a magnetic force is generated from back to front with respect to the free magnetic layer 4 of the ferromagnetic tunnel junction device 7 of the first ferromagnetic tunnel junction device 7 (that is, the magnetic force is the same as the magnetization direction of the fixed magnetic layer 3 of the first ferromagnetic tunnel junction device 7).
- the free magnetic layer 4 of the first ferromagnetic tunnel junction element 7 can be magnetized in the same direction as the magnetization direction of the fixed magnetic layer 3, while the second write wiring 11 has Electric current flows from 27 to the starting end 13, whereby the magnetic force from the front to the rear with respect to the free magnetic layer 4 of the second ferromagnetic tunnel junction device 8 (that is, the second ferromagnetic tunnel junction)
- the magnetization in the direction opposite to the magnetization direction of the fixed magnetization layer 3 of the element 8 ) Is generated, can be magnetized toward the free magnetization layer 4 of the first ferromagnetic tunnel junction element 7 in a direction opposite the magnetization direction of the fixed magnetization layer 3.
- the first and second write wirings 10 and 11 are formed in a coil shape, a write magnetic force can be generated efficiently with a small write current. Thereby, power consumption at the time of writing can be reduced. Moreover, in the present embodiment, since the winding direction of the first write wiring 10 and the winding direction of the second write wiring 11 are opposite to each other, the first and second ferromagnetic When writing contradictory stored data to the tunnel junction elements 7 and 8, the magnetic force acting on the first ferromagnetic tunnel junction element 7 and the magnetic force acting on the second ferromagnetic tunnel junction element 8 are opposite.
- a magnetic field is formed in a closed loop, and the magnetic force for magnetizing the free magnetic layer 4 of the first ferromagnetic tunnel junction element 7 and the free magnetic layer of the second ferromagnetic tunnel junction element 8 There is no interference with the magnetic force for magnetizing 4, and the stored data can be accurately written to the first and second ferromagnetic tunnel junction devices 7.8, improving the reliability of the magnetic storage device 1. be able to.
- the write magnetic force becomes a closed loop, so that the write magnetic force to the predetermined storage element 9 does not affect other storage elements 9 around the storage element 9. The storage state of the other storage elements 9 is not changed, and this can also improve the reliability of the magnetic storage device 1.
- the write wiring 15 since the start end 13 of the second write wiring 11 is connected to the end 12 of the first write wiring 10 to form a series of write wirings 15, the write wiring 15 The electric current only flows from the start end 26 to the end 27 of the write wiring 15 or from the end 27 of the write wiring 15 to the start end 26, so that the first and second ferromagnetic tunnel junction devices 7 and 8 can be mutually connected. Contradictory storage data can be stored, the configuration of the write wiring 11 can be made simple and easy to manufacture, and the manufacturing cost of the magnetic storage device 1 can be reduced. In addition, the area occupied by the write wiring 15 in the semiconductor substrate 6 can be reduced as much as possible, and the magnetic storage device 1 can be reduced in size.
- the first ferromagnetic tunnel junction device 7 and the second ferromagnetic tunnel junction are connected to the lower write wirings 17 and 21 of the first write wiring 10 and the second write wiring 11, respectively. Since the parallel wiring portions 19 and 23 extending in a direction substantially parallel to the magnetization direction of the fixed magnetization layer 3 are provided immediately below the junction element 8, the parallel wiring portions 19 and 23 are provided in a direction substantially parallel to the magnetization direction of the fixed magnetization layer 3. By the action of the magnetic force generated by the write current flowing through the extending parallel wiring portions 19 and 23, the direction of the write magnetic force acting on the free magnetic layer 4 is tilted with respect to the magnetization direction of the fixed magnetic layer 3 to generate an assist effect. The magnetization direction of free magnetic layer 4 can be changed smoothly even with a small write current, so that the power consumption of magnetic storage device 1 can be reduced.
- the present invention is not limited to such a configuration, and the upper writing wiring or the lower writing wiring of the first writing wiring or the second writing wiring.
- a parallel wiring portion may be formed on at least one of the wirings. Parallel wiring portions may be formed on the upper write wiring and the lower write wiring of the first write wiring and the second write wiring.
- the magnetic storage device 31 shown in FIGS. 4 and 5 has a first ferromagnetic tunnel junction element 37 and a second ferromagnetic tunnel junction on the surface of the same semiconductor substrate 36.
- the element 38 is orthogonal to the magnetization direction of the fixed magnetic layer 3 (see FIG. 1) of the first and second ferromagnetic tunnel junction elements 37 and 38 (the front-back direction in FIGS. 4 and 5). Are formed adjacent to each other at intervals in the direction in which they are formed.
- the first ferromagnetic tunnel junction element 37 and the second ferromagnetic tunnel junction element 38 constitute a storage element 39 for one bit.
- the storage elements 39 are formed at intervals in the left and right and up and down directions. Here, the storage element 39 for one bit will be described for easy understanding.
- the storage element 39 has a coil-shaped first write wiring 40 formed around the first ferromagnetic tunnel junction element 37 and a second ferromagnetic tunnel junction element 38.
- a second write wire 41 in the form of a coil is formed around the wire, and the start portion 43 of the second write wire 41 is connected to the end portion 42 of the first write wire 40 via the connecting portion 44. Then, a series of write wirings 45 is formed. Further, the winding direction of the first write wiring 40 (clockwise in FIG. 4) and the winding direction of the second write wiring 41 (FIG. 4 Is counterclockwise) and are opposite to each other.
- the first write wiring 40 is provided above the first ferromagnetic tunnel junction element 37 as shown in FIGS.
- Four upper write wirings 46 extending in a direction substantially perpendicular to the magnetization direction (downward in FIG. 5) of the fixed magnetic layer 3 of the element 37, and a fourth upper write wiring 46 below the first ferromagnetic tunnel junction element 37.
- the five lower write wirings 47 extending in a direction substantially perpendicular to the magnetization direction (downward in FIG. 5) of the fixed magnetization layer 3 of the ferromagnetic tunnel junction element 37 of FIG.
- the right and left edges of the lower write wiring 47 were connected via through holes 48 and wound clockwise around the first ferromagnetic tunnel junction element 37 as shown in FIG. It has a configuration.
- the first write wiring 40 is provided at the end or the middle of the upper write wiring 46 at a position directly above the first ferromagnetic tunnel junction element 37 in a direction substantially parallel to the magnetization direction of the fixed magnetization layer 3. Extending parallel wiring portions 49a are formed. '
- the first write wiring 40 has a direction substantially parallel to the magnetization direction of the fixed magnetization layer 3 at a position directly below the first ferromagnetic tunnel junction element 37 at the end or the middle of the lower write wiring 47.
- a parallel wiring portion 49b is formed to extend.
- the second write wiring 41 is provided above the second ferromagnetic tunnel junction element 38 so that the magnetization direction of the fixed magnetization layer 3 of the second ferromagnetic tunnel junction element 38 (
- four upper write wirings 50 extending in a direction substantially perpendicular to (downward) and a second ferromagnetic tunnel junction element 38 below the second ferromagnetic tunnel junction element 38
- the five lower write wirings 51 extending in a direction substantially orthogonal to the magnetization direction of the fixed magnetic layer 3 (downward in FIG. 5) are connected to the upper write wiring 50 and the lower write wiring 51 on the left and right sides. As shown in FIG. 4, they are connected to the second ferromagnetic tunnel junction device 38 in a counter-clockwise coil shape at the end portion through a through hole 52 and are wound. '
- the second write wiring 41 is provided at the end or the middle of the upper write wiring 50 at a position directly above the second ferromagnetic tunnel junction element 38 in a direction substantially parallel to the magnetization direction of the fixed magnetization layer 3.
- the extending parallel wiring portion 53a is formed.
- the second write wiring 41 has an orientation substantially parallel to the magnetization direction of the fixed magnetization layer 3 at the end or midway of the lower write wiring 51 at a position directly below the second ferromagnetic tunnel junction element 38.
- a parallel wiring portion 53b is formed to extend to the side.
- the left end of the lower write wiring 47 which is the end 42 of the first write wiring 40, is the left end of the lower write wiring 51, which is the start end 43 of the second write wiring 41. It is connected to connection part 44 via connection part 44.
- reference numerals 54 and 55 denote read wires connected to the free magnetic layer 4 of the first and second ferromagnetic tunnel junction devices 37 and 38.
- the upper write wirings 46 and 50 and the lower write wirings 47 and 51 of the first write wiring 40 and the second write wiring 41 are parallel wiring sections. 49a, 49b, 53a, 53b are formed respectively.
- the present invention is implemented in the form as described above, and has the following effects.
- a coil-shaped first write wiring is formed around the first ferromagnetic tunnel junction element, and the second ferromagnetic tunnel junction element is Since the coil-shaped second write wiring is formed in the surrounding area, a write magnetic force can be efficiently generated with a small write current, and the power consumption during writing can be reduced. Low power consumption of the storage device can be achieved.
- the storage data contradictory to the first and second ferromagnetic tunnel junction elements.
- the magnetic field generated when writing data becomes a closed loop, and the magnetic force for magnetizing the free magnetic layer of the first ferromagnetic tunnel junction device and the magnetic force for magnetizing the free magnetic layer of the second ferromagnetic tunnel junction device Interference with the magnetic force is eliminated, and the stored data can be accurately written in the first and second ferromagnetic tunnel junction elements, and the reliability of the magnetic storage device can be improved.
- the first write wiring and the second write wiring are formed of the first ferromagnetic tunnel junction element and the second 'ferromagnetic tunnel junction element. Since a parallel wiring portion extending in a direction substantially parallel to the magnetization direction of the fixed magnetic layer is provided at the position directly above or directly below the parallel wiring portion, the parallel wiring portion extending in a direction substantially parallel to the magnetization direction of the fixed magnetic layer is provided.
- the direction of the write magnetic force acting on the free magnetic layer is inclined with respect to the magnetization direction of the fixed magnetic layer, so that an assist effect can be generated, and the magnetization direction of the free magnetic layer can be smoothly changed even with a small write current. Therefore, the power consumption of the magnetic storage device can be reduced.
- the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction are configured as the first write wiring and the second write wiring.
- Upper and lower write wirings extending above and below the elements in a direction substantially perpendicular to the magnetization direction of the fixed magnetization layer of the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element; and At least one of the upper and lower write wires has a magnetization direction substantially equal to the magnetization direction of the fixed magnetization layer at a position immediately above or immediately below the first ferromagnetic tunnel junction element and the second ferromagnetic tunnel junction element.
- the configuration is such that parallel wiring portions extending in the parallel direction are provided, free magnetization is generated by the action of the magnetic force generated by the write current flowing through the parallel wiring portions extending in a direction substantially parallel to the magnetization direction of the fixed magnetic layer. Since the direction of the write magnetic force acting on the magnetic layer tilts with respect to the magnetization direction of the fixed magnetic layer, an assist effect can be generated, and the magnetization direction of the free magnetic layer can be smoothly changed even with a small write current. The power consumption of the magnetic storage device can be reduced.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE10393096T DE10393096T5 (de) | 2002-10-08 | 2003-09-18 | Magnetspeicher unter Verwendung eines ferromagnetischen Tunnelübergangselements |
AU2003299487A AU2003299487A1 (en) | 2002-10-08 | 2003-09-18 | Magnetic storage device using ferromagnetic tunnel junction element |
US10/530,271 US7542335B2 (en) | 2002-10-08 | 2003-09-18 | Magnetic storage device using ferromagnetic tunnel junction element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002294356A JP4063035B2 (ja) | 2002-10-08 | 2002-10-08 | 強磁性トンネル接合素子を用いた磁気記憶装置 |
JP2002-294356 | 2002-10-08 |
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US (1) | US7542335B2 (ja) |
JP (1) | JP4063035B2 (ja) |
KR (1) | KR20050053746A (ja) |
CN (1) | CN100338777C (ja) |
AU (1) | AU2003299487A1 (ja) |
DE (1) | DE10393096T5 (ja) |
TW (1) | TWI235372B (ja) |
WO (1) | WO2004034469A1 (ja) |
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JP4063035B2 (ja) | 2002-10-08 | 2008-03-19 | ソニー株式会社 | 強磁性トンネル接合素子を用いた磁気記憶装置 |
JP4982945B2 (ja) * | 2004-12-06 | 2012-07-25 | Tdk株式会社 | 磁気メモリ |
US8767448B2 (en) | 2012-11-05 | 2014-07-01 | International Business Machines Corporation | Magnetoresistive random access memory |
US9324937B1 (en) | 2015-03-24 | 2016-04-26 | International Business Machines Corporation | Thermally assisted MRAM including magnetic tunnel junction and vacuum cavity |
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JP2003174148A (ja) * | 2001-12-05 | 2003-06-20 | Sony Corp | 情報記憶装置およびその製造方法 |
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EP0973249A1 (en) * | 1998-07-14 | 2000-01-19 | High Voltage Engineering Europa B.V. | Inherently stabilised DC high voltage generator |
JP2002025245A (ja) * | 2000-06-30 | 2002-01-25 | Nec Corp | 不揮発性半導体記憶装置及び情報記録方法 |
WO2002078100A1 (en) * | 2001-03-23 | 2002-10-03 | Integrated Magnetoelectronics Corporation | A transpinnor-based switch and applications |
JP2003229543A (ja) * | 2002-02-04 | 2003-08-15 | Mitsubishi Electric Corp | 磁気記憶装置 |
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JP4063035B2 (ja) | 2002-10-08 | 2008-03-19 | ソニー株式会社 | 強磁性トンネル接合素子を用いた磁気記憶装置 |
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2002
- 2002-10-08 JP JP2002294356A patent/JP4063035B2/ja not_active Expired - Fee Related
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2003
- 2003-09-04 TW TW092124476A patent/TWI235372B/zh not_active IP Right Cessation
- 2003-09-18 WO PCT/JP2003/011939 patent/WO2004034469A1/ja active Application Filing
- 2003-09-18 CN CNB038253747A patent/CN100338777C/zh not_active Expired - Fee Related
- 2003-09-18 DE DE10393096T patent/DE10393096T5/de not_active Withdrawn
- 2003-09-18 US US10/530,271 patent/US7542335B2/en not_active Expired - Fee Related
- 2003-09-18 KR KR1020057005978A patent/KR20050053746A/ko not_active Application Discontinuation
- 2003-09-18 AU AU2003299487A patent/AU2003299487A1/en not_active Abandoned
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US5732016A (en) * | 1996-07-02 | 1998-03-24 | Motorola | Memory cell structure in a magnetic random access memory and a method for fabricating thereof |
US6191989B1 (en) * | 2000-03-07 | 2001-02-20 | International Business Machines Corporation | Current sensing amplifier |
JP2002231904A (ja) * | 2001-02-06 | 2002-08-16 | Mitsubishi Electric Corp | 磁気記憶装置および磁性体基板 |
US20030039062A1 (en) * | 2001-08-24 | 2003-02-27 | Hiromasa Takahasahi | Magnetic field sensor and magnetic reading head |
JP2003174148A (ja) * | 2001-12-05 | 2003-06-20 | Sony Corp | 情報記憶装置およびその製造方法 |
Also Published As
Publication number | Publication date |
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CN1701443A (zh) | 2005-11-23 |
KR20050053746A (ko) | 2005-06-08 |
TWI235372B (en) | 2005-07-01 |
JP2004133957A (ja) | 2004-04-30 |
JP4063035B2 (ja) | 2008-03-19 |
DE10393096T5 (de) | 2005-08-25 |
AU2003299487A1 (en) | 2004-05-04 |
CN100338777C (zh) | 2007-09-19 |
TW200415647A (en) | 2004-08-16 |
US20050285093A1 (en) | 2005-12-29 |
US7542335B2 (en) | 2009-06-02 |
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