Dynamic magnetic information storage or retrieval – Head
Patent
1977-06-24
1978-07-25
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
360113, 360127, 427131, 427 47, 428900, 428928, G11B 512, G11B 530
Patent
active
041033159
ABSTRACT:
In thin film magnetic transducers, e.g., inductive or magnetoresistive recording heads, at least a pair of layers of a ferromagnetic material and an antiferromagnetic material are deposited upon one another and exchange coupled to retain a unidirectional bias in the plane of the ferromagnetic material. When multiple pairs of layers are used, they are separated by layers of nonmagnetic material. In some cases, successive pairs of layers of material with unidirectional bias have their directions of bias pointing in opposite directions. The domain walls in the layers of material are minimized by this technique.
REFERENCES:
patent: 3717504 (1973-02-01), Aonuma et al.
patent: 3840898 (1974-10-01), Bajorek et al.
Hempstead Robert Douglas
Krongelb Sol
Nepela Daniel Andrew
Thompson David Allen
Valstyn Erich Philipp
International Business Machines - Corporation
Jones II Graham S.
Tupper Robert S.
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