Magnetic material structures, devices and methods

DC CAFC

US 7,128,988 B2
Filed: 08/29/2002
Issued: 10/31/2006
Est. Priority Date: 08/29/2002
Status: Expired due to Term

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1. A magnetic material structure comprising:

a substrate;

at least one bcc-d layer which is magnetic, forming a uniaxial symmetry broken structure; and

at least one layer providing a (111) textured hexagonal atomic template disposed between said substrate and said bcc-d layer.

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Abstract

A thin film magnetic structure, magnetic devices, and method of producing the same, wherein (110) textured, symmetry broken body centered cubic or body centered cubic derivative crystalline structures epitaxially grown on hexagonal shaped templates, in the presence of a symmetry breaking mechanism is provided to promote oriented uniaxial magnetic properties from a series of successively deposited film layers, result in new oriented magnetic layer structures and microstructures and thus improved magnetic devices and device performance.

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41 Claims

1. A magnetic material structure comprising:
- a substrate;
  
  at least one bcc-d layer which is magnetic, forming a uniaxial symmetry broken structure; and
  
  at least one layer providing a (111) textured hexagonal atomic template disposed between said substrate and said bcc-d layer.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- - 2. The magnetic material structure recited in claim 1, wherein said substrate is single crystal.
  - 3. The magnetic material structure recited in claim 1, wherein a surface of said substrate is amorphous or polycrystalline.
  - 4. The magnetic material structure recited in claim 1, further comprising an amorphous layer on said substrate formed from an alloy of NiP, CrxTa1−
    - x, CrxNb1−
      
      x, FexTa1−
      
      x, or FexNb1−
      
      x and 55<
      
      x<
      
      75.
  - 5. The magnetic material structure recited in claim 4, wherein said amorphous layer is formed and the surface of the said amorphous layer is then oxidized.
  - 6. The magnetic material structure recited in claim 1, wherein the layer providing said hexagonal atomic template is formed from a fcc-d or hcp crystalline material.
  - 7. The magnetic material structure recited in claim 1, wherein the layer providing said hexagonal atomic template is magnetic.
  - 8. The magnetic material structure recited in claim 1, wherein said bcc-d layer is epitaxially grown on said (111) textured hexagonal atomic template and has a (110) crystalline texture, and at least one crystalline grain of said (111) textured hexagonal atomic template has epitaxially grown thereon at least two and not more than four dominate (110) orientational variants.
  - 9. The magnetic material structure according to claim 1, further comprising:
    - a second layer providing a (111) textured hexagonal atomic template, wherein said second layer is magnetic.
  - 10. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer which is non-magnetic.
  - 11. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer which is magnetic.
  - 12. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer wherein the crystalline orientation of the second bcc-d layer is epitaxially determined by said bcc-d layer.
  - 13. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer; and
      
      a second layer providing a (111) textured hexagonal atomic template wherein said second layer providing a (111) textured hexagonal atomic template is disposed between said bcc-d layers.
  - 14. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer, which is magnetic; and
      
      at least one oxide layer between said bcc-d layers.
  - 15. The magnetic material structure according to claim 1, further comprising:
    - a second and a third bcc-d layers which are non-magnetic;
      
      a fourth bcc-d layer which is magnetic; and
      
      at least one oxide layer between said second bcc-d layer and said third bcc-d layerwherein said second and third bcc-d layers are disposed between said first and fourth bcc-d layers.
  - 16. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer which is magnetic;
      
      a second (111) textured hexagonal atomic template layer between said bcc-d layers; and
      
      at least one oxide layer between said bcc-d layers.
  - 17. The magnetic material structure recited in claim 1, wherein said bcc-d layer forming a uniaxial symmetry broken structure is composed of Fe or FeCo or an alloy of Fe or FeCo.
  - 18. The magnetic material structure recited in claim 1, wherein said bcc-d layer forming a uniaxial symmetry broken structure is composed of an alloy of Fe or FeCo having one or more of the elements Al, B, Cr, C, Cu, Ni, N, Nb, Mo, V, Si, Ta, and Ti.
  - 19. The magnetic material structure recited in claim 1, wherein the layer material forming said (111) textured hexagonal atomic template is composed of Ag, Al, Au, Cu, fcc-Co, fcc-CoCr, Ir, Ni, NiFe, Pt, Rh, Pd, hcp-Co, Gd, Re Ru, Tb, Ti, or alloys of one of these materials combined with at least one element.
  - 20. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer which is magnetic;
      
      wherein the bcc-d layers have anisotropy energy density constants of opposite sign.
  - 21. The magnetic material structure according to claim 1, further comprising:
    - a coupling layer; and
      
      a second bcc-d layer which is magnetic wherein the coupling layer material antiferromagnetically couples the bcc-d layers.
  - 22. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer which is magnetic; and
      
      a third bcc-d layer disposed between the bcc-d layers which are magnetic.
  - 23. The magnetic material structure according to claim 1, further comprising:
    - a second bcc-d layer which is magnetic; and
      
      a second (111) textured hexagonal atomic template layer wherein said second (111) textured hexagonal atomic template is disposed between said bcc-d layers.
  - 24. The magnetic material structure according to claim 1, further comprising:
    - at least one magnetic hcp Co alloy layer.
  - 25. The magnetic material structure according to claim 1, further comprising:
    - at least one magnetic hcp Co alloy layer;
      
      wherein said hcp Co alloy has a (1011) crystalline texture.
  - 26. The magnetic material structure according to claim 1, wherein:
    - said substrate is a (111) crystalline textured single crystal; and
      
      a surface of said single crystal provides a layer providing the (111) textured hexagonal atomic template disposed between the bulk of said substrate and said at least one bcc-d layer.

27. A magnetic device having incorporated therein a magnetic material structure comprising:
- a substrate;
  
  at least one bcc-d layer which is magnetic, forming a uniaxial symmetry broken structure; and
  
  at least one layer providing a (111) textured hexagonal atomic template disposed between said substrate and said bcc-d layer.
- View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
- - 28. The magnetic device recited in claim 27, wherein the device is a magnetic data storage system.
  - 29. The magnetic device recited in claim 27, wherein the device is a data storage magnetic recording transducer.
  - 30. The magnetic device recited in claim 27, wherein the device is at least one of:
    - an anisotropic magnetoresistive sensor;
      
      a spin valve magnetoresistive sensor;
      
      a magnetic tunnel junction magnetoresistive sensor and a data storage magnetic playback transducer.
  - 31. The magnetic device recited in claim 27, wherein the device is at least one of:
    - a data storage magnetic recording media;
      
      a data storage magnetic recording media incorporating an oriented soft magnetic layer; and
      
      a data storage magnetic recording media incorporating an oriented hard magnetic layer.
  - 32. The magnetic device recited in claim 27, wherein the device is a data storage magnetic random access memory.
  - 33. The magnetic device recited in claim 27, wherein the device is at least one of:
    - an article surveillance tag;
      
      an article identification tag;
      
      a magnetoelastic article tag;
      
      a magnetoelastic multiple harmonic generating article tag; and
      
      a non-linear response multiple harmonic generating article tag.
  - 34. The magnetic device recited in claim 27, wherein the device is at least one of:
    - an electronic circuit inductive component and an electronic circuit inductive transformer component.
  - 35. The magnetic device recited in claim 27, wherein the device is a signal mixing electronic circuit component.
  - 36. The magnetic device recited in claim 27, wherein the device is a magnetic fluxgate sensor.
  - 37. The magnetic device recited in claim 27, wherein the device is at least one of:
    - an electronic spin transport digital logic circuit component and an electronic spin transport analog circuit component.
  - 38. The magnetic device according to claim 27, further comprising:
    - at least one hard magnetic layer;
      
      whereinsaid at least one bcc-d layer which is magnetic, forming a uniaxial symmetry broken structure, is disposed between said (111) textured hexagonal atomic template and said at least one hard magnetic layer.
  - 39. The magnetic device according to claim 27, further comprising:
    - at least one hard magnetic layer;
      
      whereinsaid at least one hard magnetic layer is disposed between said substrate and said at least one bcc-d layer.
  - 40. The magnetic device according to claim 27, further comprising:
    - at least one hard magnetic recording layer;
      
      whereinsaid at least one bcc-d layer, which acts as a soft magnetic keeper layer, forming a uniaxial symmetry broken structure, is disposed between said (111) textured hexagonal atomic template and said at least one hard magnetic recording layer.
  - 41. The magnetic device according to claim 40, wherein:
    - said at least one hard magnetic recording layer has a preferred magnetic orientation perpendicular to the substrate.

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Litigation Data

Current Assignee
Lambeth Magnetic Structures LLC
Original Assignee
Lambeth Systems
Inventors
Lambeth, David N.
Primary Examiner(s)
RICKMAN, HOLLY C

Application Number

US10/415,757
Publication Number

US 20040058196A1
Time in Patent Office

1,524 Days
Field of Search

428/828, 428/831.2, 428/832, 428/815
US Class Current

428/831.2
CPC Class Codes

B82Y 10/00   Nanotechnology for informat...

B82Y 25/00   Nanomagnetism, e.g. magneto...

C23C 14/228   Gas flow assisted PVD depos...

C23C 14/35   by application of a magneti...

G11B 2005/3996   large or giant magnetoresis...

G11B 5/3903   using magnetic thin film la...

G11B 5/3909   Arrangements using a magnet...

G11B 5/65   characterised by its compos...

G11B 5/657   containing inorganic, non-o...

G11B 5/66   the record carriers consist...

G11B 5/674   having differing macroscopi...

G11B 5/676   having magnetic layers sepa...

G11B 5/678   having three or more magnet...

G11B 5/739   Magnetic recording media su...

H01F 10/16   containing cobalt H01F10/12...

H01F 10/30   characterised by the compos...

H01F 10/3254   the spacer being semiconduc...

H01F 10/3268   the exchange coupling being...

Magnetic material structures, devices and methods

First Claim

5 Assignments

Litigations

1 Petition

Accused Products

Abstract

45 Citations

41 Claims

Specification

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Magnetic material structures, devices and methods

First Claim

5 Assignments

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Litigations

1 Petition

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Accused Products

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Abstract

45 Citations

41 Claims

Specification

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Solutions

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