US20120294137A1 - Ferroelectric read head - Google Patents
Ferroelectric read head Download PDFInfo
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- US20120294137A1 US20120294137A1 US13/557,584 US201213557584A US2012294137A1 US 20120294137 A1 US20120294137 A1 US 20120294137A1 US 201213557584 A US201213557584 A US 201213557584A US 2012294137 A1 US2012294137 A1 US 2012294137A1
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- Prior art keywords
- channel region
- ferroelectric
- read head
- head
- drain
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/02—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using ferroelectric record carriers; Record carriers therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
Definitions
- Apparatuses consistent with the present invention relate to a ferroelectric hard disk device and, more particularly, to a ferroelectric hard disk device in which a hard disk media is formed to include a ferroelectric body to store and reproduce information using the switching principle of a ferroelectric dipole.
- a hard disk drive (HDD) device one kind of information storage medium, usually includes a round-shaped disk type media with a magnetic layer on which a magnetic head for writing and reading information is formed.
- the magnetic head is installed in a suspension formed at an end of a swing arm, and is moved to desired track position on the media according to the operation of the swing arm to perform writing and reading operations.
- the magnetic head includes a reading head for outputting information stored in the media and a writing head for storing information.
- HDD devices have been developed as perpendicular magnetic recording types from horizontal magnetic recording types to increase the recording densities of information.
- FIG. 1 is a cross-sectional view of a recording head and a recording medium of a typical HDD device.
- the typical perpendicular magnetic recording device includes a recording medium 110 , a recording head 120 recording data to the recording medium 110 , and a reading head 130 for reading the data on the recording medium 110 .
- the recording medium 110 usually includes a substrate 111 , a magnetic recording layer 112 on which information is recorded, and a protection layer 113 .
- the recording head 120 includes a main pole P 1 , a return pole P 2 , and a coil C.
- the main pole P 1 and the return pole P 2 may be formed of a magnetic material such as nickel iron (NiFe), and here, the component ratio of each material should be different to obtain different coercivities for the main pole P 1 and the return pole P 2 .
- the main pole P 1 and the return pole P 2 are used directly to record data to the magnetic recording layer 112 of the perpendicular magnetic recording medium 110 .
- the reading head 130 includes first and second magnetic shield layers S 1 and S 2 , and a magnetic resistance device 131 formed between the first and second magnetic shield layers S 1 and S 2 . While reading data of a predetermined region of the selected track, the first and second magnetic shield layers S 1 and S 2 shield any other magnetic fields generated from magnetic elements around the region from arriving at the region being read.
- the data reading head 130 may be a magnetic resistance device such as a giant magneto resistance (GMR) structure or a tunnel magneto resistance (TMR) structure.
- the magnetic resistance devices as described above use a perpendicular magnetic recording method to increase the information storage density; however, it is known that the recording density thereof of is 500-600 Gb/in 2 at most. Thus a further improved high density information storage device is required.
- Exemplary embodiments of the present invention provide a ferroelectric hard disk device including a media recording layer formed of a ferroelectric body and a head capable of easily storing and reproducing information to a ferroelectric layer.
- a ferroelectric hard disk device comprising: a ferroelectric media comprising a bottom electrode and a ferroelectric layer disposed on the bottom electrode; and a head disposed above the ferroelectric media, the head being operative to write and reproduce information on the ferroelectric layer.
- the head may comprise: a substrate; an insulating layer disposed on the substrate; a reading head disposed on the insulating layer, the reading head including a source, drain, and channel region; a separation layer disposed on the reading head; and a writing head disposed on the separation layer.
- the source and the drain may be disposed on opposite sides of the insulating layer, and the channel region is disposed between the source and the drain.
- the writing head may comprise: a source and a drain disposed on opposite sides of the insulating layer; and a channel region disposed between the source and the drain.
- FIG. 1 illustrates a typical hard disk device according to the related art
- FIG. 2 illustrates a ferroelectric hard disk device according to an exemplary embodiment of the present invention
- FIG. 3 is a perspective view of a media of a ferroelectric hard disk device according to an exemplary embodiment of the present invention
- FIG. 4 illustrates an air bearing surface (ABS) of a head of the ferroelectric hard disk device according to the present invention
- FIGS. 5A and 5B illustrate the information storage principle of the ferroelectric hard disk device according to the present invention
- FIGS. 6A and 6B illustrate the information reproducing principle of the ferroelectric hard disk device according to the present invention.
- FIG. 7 is an XRD graph of a sample of the media formed as described with reference to FIG. 3 .
- FIG. 2 illustrates a ferroelectric hard disk device according to an exemplary embodiment of the present invention.
- the ferroelectric hard disk device includes a ferroelectric media 20 and a head 21 for writing or reading information stored in the ferroelectric media 20 .
- the ferroelectric media 20 includes a ferroelectric layer 202 formed on a, for example, base or bottom electrode 201 .
- a ferroelectric material has a spontaneous polarization property and the polarization direction of a dipole of the ferroelectric material is reversed by an external electric field.
- information is recorded such that a dipole of a domain D, which is an information unit of the ferroelectric layer 202 of the ferroelectric media 20 , has an upward or downward polarization direction, and the information is read by detecting the polarization direction.
- the head 21 includes a reading head 212 and a writing head 213 that are formed on a side of an insulating layer 211 .
- FIG. 3 is a perspective view of a media of a ferroelectric hard disk device according to an exemplary embodiment of the present invention.
- a media 20 includes a seed layer 32 , a bottom electrode 201 , and a ferroelectric layer 202 sequentially formed on a substrate 31 .
- a protection layer 33 may be further formed on the ferroelectric layer 202 .
- the substrate 31 may be formed of, for example, Si, glass, etc.
- the bottom electrode 201 may be formed of an electrode material that is usually used for a typical semiconductor memory device, and may be formed of, for example, a metal such as Pt, Al, Au, Ag, Cu, etc. or a metal oxide such as SrRuO 3 , (La,Sr)CoO, etc.
- the ferroelectric layer 202 may be formed of a ferroelectric material such as PZT(PbZr x Ti 1-x O 3 ) (0 ⁇ x ⁇ 1), PbTiO 3 ,PbZrO 3 , PbTiO 3 , SrBi 2 Ta 2 O 9 (SBT), KNbO 3 , LiTaO 3 , LiNbO 3 .
- the protection layer 33 may be formed by using diamond like carbon (DLC) and a lubricant that is usually used for a surface of a hard disk device together, or by using either one of the DLC and the lubricant.
- DLC diamond like carbon
- FIG. 7 is an X-ray diffraction (XRD) graph of a slice of a sample of the media formed as described with reference to FIG. 3 , and here, the domain, which is an information region unit formed on the ferroelectric layer, had a width of about 38 nm.
- XRD X-ray diffraction
- FIG. 4 illustrates an air bearing surface (ABS) of a head of the ferroelectric hard disk device consistent with the present invention.
- an insulating layer 211 is formed on a substrate 41 , and a reading head 212 is formed on the insulating layer 211 .
- the reading head 212 includes a source 212 a and a drain 212 b formed on either side of the insulating layer 211 and a channel region 212 c formed between the source 212 a and the drain 212 b .
- a writing head 213 is formed on the reading head 212 .
- the substrate 41 may be, for example, an Si substrate that is usually used for a semiconductor device, and the insulating layer 211 may be formed of a material such as SiO 2 .
- the source 212 a and the drain 212 b are formed of a material having a higher conductivity than the channel region 212 c.
- An example of a manufacturing method of the reading head 212 is as follows.
- a silicon on insulator (SOI) substrate including the insulating layer 211 in its middle portion is provided, and then As or P is doped to a density of about 10 20 /cm 3 on both sides of the channel region 212 c to form the source 212 a and the drain 212 b , and to a density of about 10 17 /cm 3 on the channel region 212 c to manufacture a reading head 212 .
- An insulating material such as SiO 2 is coated on the reading head 212 to form a separation layer 43 .
- the separation layer 43 is formed in order to separate the reading head 212 and the writing head 213 electrically.
- the writing head 213 is formed on the separation layer 43 to coat a conductive material such as metal.
- the writing head 213 may be formed of polysilicon, Al, Au, Ag, Pt, Cu, etc.
- the width of the writing head 213 is illustrated to be similar to the width of the channel region 212 c , but is not limited to this case and can be selected arbitrarily.
- FIGS. 5A and 5B illustrate the information writing principle of a ferroelectric hard disk device according to an exemplary embodiment of the present invention.
- the information writing principle of a domain which is an information region unit of a ferroelectric layer 202 , by forming a dipole having a downward polarization direction will be described with reference to FIG. 5A .
- a negative potential is applied to the bottom electrode 201
- a positive potential is applied to the writing head 213 .
- a dipole having a downward polarization direction is formed in the ferroelectric layer 202 of the writing head 213 .
- a positive potential is applied to the bottom electrode 201 , and a negative potential is applied to the writing head 213 .
- a dipole having an upward polarization direction is formed in the ferroelectric layer 202 below the writing head 213 .
- FIGS. 6A and 6B illustrate the information reading principle of a ferroelectric hard disk device according to an exemplary embodiment of the present invention.
- FIG. 6A when a dipole having a downward polarization direction is formed in the ferroelectric layer 202 below the reading head 212 , electron depletion is generated in the channel region 212 c of the reading head 212 and thus a low current flows between the source 212 a and the drain 212 b.
- the information recording region of a media of a hard disk device is formed of a ferroelectric body, information is recorded by dividing a domain in the ferroelectric body into information region units and controlling the polarization direction of a dipole, and the information is read by detecting the polarization direction of the dipole. Since the size of the domain is minimized, the information storage density can be significantly increased compared to an HDD device using a conventional magnetic recording method.
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- Magnetic Record Carriers (AREA)
Abstract
An apparatus can include a read head formed in a semiconductor layer of an air bearing surface, the read head comprising a channel region formed between a source and drain which are doped to a higher conductivity than the channel region; wherein the channel region is configured to generate a charge carrier depletion region in response to a first ferroelectric dipole direction, and to accumulate charge carriers in response to a second ferroelectric dipole direction.
Description
- This application is a continuation of U.S. patent application Ser. No. 11/964,328, filed on Dec. 26, 2007, which claims priority from Korean Patent Application No. 10-2007-0034413, filed on Apr. 6, 2007 in the Korean Intellectual Property Office, the disclosures of which are incorporated herein in their entirety by reference.
- 1. Field of the Invention
- Apparatuses consistent with the present invention relate to a ferroelectric hard disk device and, more particularly, to a ferroelectric hard disk device in which a hard disk media is formed to include a ferroelectric body to store and reproduce information using the switching principle of a ferroelectric dipole.
- 2. Description of the Related Art
- With industrialization and the proliferation of information, the amount of information a person or an organization processes is increasing rapidly. Computers, which can be used to access the internet to get a wide range of information, and which have high data processing speeds and large data capacities are already widely used. In order to increase the data processing speed of the computers, CPU chips and computer peripheral appliances have been improved. Also, in order to improve data storage capacities, high densification for various kinds of information storage mediums, for example, hard disk drives, is being attempted.
- A hard disk drive (HDD) device, one kind of information storage medium, usually includes a round-shaped disk type media with a magnetic layer on which a magnetic head for writing and reading information is formed. The magnetic head is installed in a suspension formed at an end of a swing arm, and is moved to desired track position on the media according to the operation of the swing arm to perform writing and reading operations. The magnetic head includes a reading head for outputting information stored in the media and a writing head for storing information. Recently, HDD devices have been developed as perpendicular magnetic recording types from horizontal magnetic recording types to increase the recording densities of information.
-
FIG. 1 is a cross-sectional view of a recording head and a recording medium of a typical HDD device. Referring toFIG. 1 , the typical perpendicular magnetic recording device includes a recording medium 110, arecording head 120 recording data to the recording medium 110, and areading head 130 for reading the data on the recording medium 110. - The recording medium 110 usually includes a
substrate 111, a magnetic recording layer 112 on which information is recorded, and aprotection layer 113. Therecording head 120 includes a main pole P1, a return pole P2, and a coil C. The main pole P1 and the return pole P2 may be formed of a magnetic material such as nickel iron (NiFe), and here, the component ratio of each material should be different to obtain different coercivities for the main pole P1 and the return pole P2. The main pole P1 and the return pole P2 are used directly to record data to the magnetic recording layer 112 of the perpendicular magnetic recording medium 110. Anauxiliary pole 121 is further formed at a side of the main pole P1 so that a magnetic field generated around the main pole P1 during data recording is gathered in a selected region of the perpendicular magnetic recording medium 110. The coil C surrounds the main pole P1 and generates a magnetic field. Thereading head 130 includes first and second magnetic shield layers S1 and S2, and amagnetic resistance device 131 formed between the first and second magnetic shield layers S1 and S2. While reading data of a predetermined region of the selected track, the first and second magnetic shield layers S1 and S2 shield any other magnetic fields generated from magnetic elements around the region from arriving at the region being read. Thedata reading head 130 may be a magnetic resistance device such as a giant magneto resistance (GMR) structure or a tunnel magneto resistance (TMR) structure. - The magnetic resistance devices as described above use a perpendicular magnetic recording method to increase the information storage density; however, it is known that the recording density thereof of is 500-600 Gb/in2 at most. Thus a further improved high density information storage device is required.
- Exemplary embodiments of the present invention provide a ferroelectric hard disk device including a media recording layer formed of a ferroelectric body and a head capable of easily storing and reproducing information to a ferroelectric layer.
- According to an aspect of the present invention, there is provided a ferroelectric hard disk device comprising: a ferroelectric media comprising a bottom electrode and a ferroelectric layer disposed on the bottom electrode; and a head disposed above the ferroelectric media, the head being operative to write and reproduce information on the ferroelectric layer.
- The head may comprise: a substrate; an insulating layer disposed on the substrate; a reading head disposed on the insulating layer, the reading head including a source, drain, and channel region; a separation layer disposed on the reading head; and a writing head disposed on the separation layer.
- The source and the drain may be disposed on opposite sides of the insulating layer, and the channel region is disposed between the source and the drain.
- The writing head may comprise: a source and a drain disposed on opposite sides of the insulating layer; and a channel region disposed between the source and the drain.
- The above and other features and aspects of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:
-
FIG. 1 illustrates a typical hard disk device according to the related art; -
FIG. 2 illustrates a ferroelectric hard disk device according to an exemplary embodiment of the present invention; -
FIG. 3 is a perspective view of a media of a ferroelectric hard disk device according to an exemplary embodiment of the present invention; -
FIG. 4 illustrates an air bearing surface (ABS) of a head of the ferroelectric hard disk device according to the present invention; -
FIGS. 5A and 5B illustrate the information storage principle of the ferroelectric hard disk device according to the present invention; -
FIGS. 6A and 6B illustrate the information reproducing principle of the ferroelectric hard disk device according to the present invention; and -
FIG. 7 is an XRD graph of a sample of the media formed as described with reference toFIG. 3 . - The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. Here, the layers and the thicknesses of the region illustrated in the drawings are exaggerated for clarity of description.
-
FIG. 2 illustrates a ferroelectric hard disk device according to an exemplary embodiment of the present invention. - Referring to
FIG. 2 , the ferroelectric hard disk device according to the present invention includes aferroelectric media 20 and ahead 21 for writing or reading information stored in theferroelectric media 20. Theferroelectric media 20 includes aferroelectric layer 202 formed on a, for example, base orbottom electrode 201. - A ferroelectric material has a spontaneous polarization property and the polarization direction of a dipole of the ferroelectric material is reversed by an external electric field. In the ferroelectric hard disk drive consistent with the present invention, information is recorded such that a dipole of a domain D, which is an information unit of the
ferroelectric layer 202 of theferroelectric media 20, has an upward or downward polarization direction, and the information is read by detecting the polarization direction. Thehead 21 includes areading head 212 and awriting head 213 that are formed on a side of aninsulating layer 211. -
FIG. 3 is a perspective view of a media of a ferroelectric hard disk device according to an exemplary embodiment of the present invention. Referring toFIG. 3 , amedia 20 includes aseed layer 32, abottom electrode 201, and aferroelectric layer 202 sequentially formed on asubstrate 31. Aprotection layer 33 may be further formed on theferroelectric layer 202. - The
substrate 31 may be formed of, for example, Si, glass, etc. Thebottom electrode 201 may be formed of an electrode material that is usually used for a typical semiconductor memory device, and may be formed of, for example, a metal such as Pt, Al, Au, Ag, Cu, etc. or a metal oxide such as SrRuO3, (La,Sr)CoO, etc. Theferroelectric layer 202 may be formed of a ferroelectric material such as PZT(PbZrxTi1-xO3) (0<x<1), PbTiO3,PbZrO3, PbTiO3, SrBi2Ta2O9 (SBT), KNbO3, LiTaO3, LiNbO3. Theprotection layer 33 may be formed by using diamond like carbon (DLC) and a lubricant that is usually used for a surface of a hard disk device together, or by using either one of the DLC and the lubricant. - A sample of the present invention was formed having a
bottom electrode 201 using Pt formed to a thickness of about 20 nm on a glass substrate and aferroelectric layer 202 using PbTiO3 formed to a thickness of about 40 nm.FIG. 7 is an X-ray diffraction (XRD) graph of a slice of a sample of the media formed as described with reference toFIG. 3 , and here, the domain, which is an information region unit formed on the ferroelectric layer, had a width of about 38 nm. -
FIG. 4 illustrates an air bearing surface (ABS) of a head of the ferroelectric hard disk device consistent with the present invention. Referring toFIG. 4 , an insulatinglayer 211 is formed on asubstrate 41, and areading head 212 is formed on the insulatinglayer 211. The readinghead 212 includes asource 212 a and adrain 212 b formed on either side of the insulatinglayer 211 and achannel region 212 c formed between thesource 212 a and thedrain 212 b. A writinghead 213 is formed on thereading head 212. - The
substrate 41 may be, for example, an Si substrate that is usually used for a semiconductor device, and the insulatinglayer 211 may be formed of a material such as SiO2. Thesource 212 a and thedrain 212 b are formed of a material having a higher conductivity than thechannel region 212 c. - An example of a manufacturing method of the
reading head 212 is as follows. A silicon on insulator (SOI) substrate including the insulatinglayer 211 in its middle portion is provided, and then As or P is doped to a density of about 1020/cm3 on both sides of thechannel region 212 c to form thesource 212 a and thedrain 212 b, and to a density of about 1017/cm3 on thechannel region 212 c to manufacture areading head 212. An insulating material such as SiO2 is coated on thereading head 212 to form aseparation layer 43. Theseparation layer 43 is formed in order to separate thereading head 212 and thewriting head 213 electrically. The writinghead 213 is formed on theseparation layer 43 to coat a conductive material such as metal. The writinghead 213 may be formed of polysilicon, Al, Au, Ag, Pt, Cu, etc. - In
FIG. 4 , the width of the writinghead 213 is illustrated to be similar to the width of thechannel region 212 c, but is not limited to this case and can be selected arbitrarily. - Hereinafter, the writing and reading principle of a ferroelectric hard disk drive according to an exemplary embodiment of the present invention will be described with reference to the drawings.
-
FIGS. 5A and 5B illustrate the information writing principle of a ferroelectric hard disk device according to an exemplary embodiment of the present invention. The information writing principle of a domain, which is an information region unit of aferroelectric layer 202, by forming a dipole having a downward polarization direction will be described with reference toFIG. 5A . A negative potential is applied to thebottom electrode 201, and a positive potential is applied to thewriting head 213. In this case, a dipole having a downward polarization direction is formed in theferroelectric layer 202 of the writinghead 213. - In order to form a dipole having an upward polarization direction, as illustrated in
FIG. 5B , a positive potential is applied to thebottom electrode 201, and a negative potential is applied to thewriting head 213. In this case, in theferroelectric layer 202 below the writinghead 213, a dipole having an upward polarization direction is formed. -
FIGS. 6A and 6B illustrate the information reading principle of a ferroelectric hard disk device according to an exemplary embodiment of the present invention. Referring toFIG. 6A , when a dipole having a downward polarization direction is formed in theferroelectric layer 202 below the readinghead 212, electron depletion is generated in thechannel region 212 c of thereading head 212 and thus a low current flows between thesource 212 a and thedrain 212 b. - On the other hand, as illustrated in
FIG. 6B , when a dipole having an upward polarization direction is formed in theferroelectric layer 202 below the readinghead 212, electron accumulation occurs in thechannel region 212 c of thereading head 212 and thus a high current flows between thesource 212 a and thedrain 212 b. That is, the drain current Id flowing between thesource 212 a and thedrain 212 b of thereading head 212 varies greatly according to the polarization direction of the dipole included in the domain, which is the information region unit of theferroelectric layer 202. Thus, information is read by detecting the polarization direction of the dipole of theferroelectric layer 202 according to the difference in the current values. - According to the present invention, the information recording region of a media of a hard disk device is formed of a ferroelectric body, information is recorded by dividing a domain in the ferroelectric body into information region units and controlling the polarization direction of a dipole, and the information is read by detecting the polarization direction of the dipole. Since the size of the domain is minimized, the information storage density can be significantly increased compared to an HDD device using a conventional magnetic recording method.
- While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (20)
1. An apparatus, comprising:
a read head formed in a semiconductor layer of an air bearing surface, the read head comprising
a channel region formed between a source and drain which are doped to a higher conductivity than the channel region; wherein
the channel region is configured to generate a charge carrier depletion region in response to a first ferroelectric dipole direction, and to accumulate charge carriers in response to a second ferroelectric dipole direction.
2. The apparatus of claim 1 , wherein:
the semiconductor layer comprises silicon.
3. The apparatus of claim 1 , wherein:
the air bearing surface comprises a semiconductor-on-insulator structure comprising an insulating layer formed between the semiconductor layer and a semiconductor substrate portion.
4. The apparatus of claim 3 , wherein:
the semiconductor layer and semiconductor substrate portion comprise silicon, and
the insulating layer comprises silicon dioxide.
5. The apparatus of claim 1 , further including:
a write head configured to receive at least two different voltages, each corresponding to the formation of a different ferroelectric dipole direction.
6. The apparatus of claim 5 , wherein:
the write head is formed over the channel region and separated from the read head by an insulating separation layer.
7. The apparatus of claim 5 , wherein:
the write head is formed from a material selected from the group of: silicon, aluminum, gold, silver, platinum and copper.
8. An apparatus, comprising:
a read head comprising a semiconductor layer having regions with different doping densities, the read head configured to vary a current flow through a channel region between two doped regions in response to a direction of a ferroelectric dipole in proximity to the channel region.
9. The apparatus of claim 8 , wherein:
the read head is configured to enable a first current flow between two doped regions in response to a first ferroelectric dipole orientation, and to enable a second current flow between the two doped regions in response to a second ferroelectric dipole orientation; wherein,
the first current is smaller than the second current.
10. The apparatus of claim 9 , wherein:
the read head comprises the channel region, a source, and a drain, the source and drain being doped to a higher concentration than the channel region; wherein
the first and second currents flow between the source and drain through the channel region.
11. The apparatus of claim 10 , wherein:
the read head comprises a portion of an air bearing surface having a bottom surface; and
the source, channel region, and drain are disposed adjacent to one another in a direction parallel to the bottom surface.
12. The apparatus of claim 8 , wherein:
the read head comprises a portion of an air bearing surface having a bottom surface; and
the read head is separated from the bottom surface by at least one insulating layer.
13. The apparatus of claim 8 , further including:
a write head configured to receive a plurality of voltages to establish a ferroelectric dipole direction in a ferroelectric medium.
14. The apparatus of claim 13 , wherein:
the read head and write head comprise portions of an air bearing surface having a bottom surface; and
the read head is disposed between the bottom surface and the write head.
15. A method, comprising:
determining a data value stored by a ferroelectric medium according to a conductivity of a read head channel region formed between a source and drain; wherein
the conductivity of the channel region varies in response to an orientation of a ferroelectric dipole in proximity to the channel region.
16. The method of claim 15 , wherein:
a current flowing through the channel region, between the source and drain, varies according to the orientation of the ferroelectric dipole.
17. The method of claim 15 , wherein:
determining the data value includes positioning an air bearing surface comprising the read head over the ferroelectric medium.
18. The method of claim 15 , wherein:
the channel region is depleted of charge carriers in response to the ferroelectric dipole having a first orientation, and accumulates the charge carriers in response to the ferroelectric dipole having a second orientation.
19. The method of claim 15 , further including:
storing a data value in the ferroelectric medium according to a voltage applied to a write head positioned over the channel region.
20. The method of claim 19 , wherein:
storing the data value includes positioning an air bearing surface comprising the write head and the read head over the ferroelectric medium.
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US13/557,584 US20120294137A1 (en) | 2007-04-06 | 2012-07-25 | Ferroelectric read head |
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KR1020070034413A KR20080090932A (en) | 2007-04-06 | 2007-04-06 | Ferroelectric hard disk system |
KR10-2007-0034413 | 2007-04-06 | ||
US11/964,328 US8248906B2 (en) | 2007-04-06 | 2007-12-26 | Ferroelectric hard disk system |
US13/557,584 US20120294137A1 (en) | 2007-04-06 | 2012-07-25 | Ferroelectric read head |
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US13/557,584 Abandoned US20120294137A1 (en) | 2007-04-06 | 2012-07-25 | Ferroelectric read head |
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US11087791B1 (en) | 2020-05-05 | 2021-08-10 | Western Digital Technologies, Inc. | Data storage device with voltage-assisted magnetic recording (VAMR) for high density magnetic recording |
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KR100842897B1 (en) * | 2007-01-29 | 2008-07-03 | 삼성전자주식회사 | Structure of ferroelectric media for ferroelectric hdd and method of manufacture thereof |
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Also Published As
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KR20080090932A (en) | 2008-10-09 |
US20080247085A1 (en) | 2008-10-09 |
US8248906B2 (en) | 2012-08-21 |
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