Spin-valve sensor with pinning layers comprising multiple...

Details Spin-valve sensor with pinning layers comprising multiple... Spin-valve sensor with pinning layers comprising multiple...

2005-05-24

2005-05-24

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C428S670000, C428S678000, C428S680000, C428S686000, C428S215000, C428S216000, C428S332000, C428S336000, C428S692100, C360S324110

Reexamination Certificate

active

06896975

ABSTRACT:
A spin-valve sensor with pinning layers comprising multiple antiferromagnetic films is disclosed. The multiple antiferromagnetic films are preferably selected from the same Mn-based (Ni—Mn or Pt—Mn) alloy system. The Mn content of the antiferromagnetic film in contact with the reference layer of the spin-valve sensor is selected in order to maximize its exchange coupling to the reference layer, thereby providing a high unidirectional anisotropy field for proper sensor operation. The Mn content of the other antiferromagnetic films not in contact with the reference layer of the spin-valve sensor is reduced in order to maximize the thermal stability and corrosion resistance of the spin-valve sensor for robust sensor operation at high temperatures in disk drive environments.

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English Translation of JP 11-175919 A (PTO 04-274).

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