Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1994-07-26
1996-06-18
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Head
Hall effect
338 32R, 324252, G11B 539, H01L 4308, G01R 3302
Patent
active
055284400
ABSTRACT:
An improved spin valve (SV) magnetoresistive element has its free ferromagnetic layer in the form of a central active region with defined edges and end regions that are contiguous with and abut the edges of the central active region. A layer of antiferromagnetic material, preferably a nickel-manganese (Ni--Mn) alloy, is formed on and in contact with the ferromagnetic material in the end regions for exchange coupling with the end regions to provide them with a longitudinal bias of their magnetizations. The pinned ferromagnetic layer in the SV element is pinned by exchange coupling with a different layer of antiferromagnetic material, preferably an iron-manganese (Fe--Mn) alloy. This material has a substantially different Neel temperature from that of the antiferromagnetic material on the end regions. The process for making the SV element includes heating to different predetermined temperatures in the presence of an applied magnetic field to orient the magnetizations of the free and pinned layers in the proper direction. The SV element may be used as a sensor for reading data in magnetic recording systems.
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Fontana Robert E.
Lin Tsann
Tsang Ching H.
Berthold Thomas R.
International Business Machines - Corporation
Levy Stuart S.
Miller Brian E.
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