Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2006-06-06
2006-06-06
Chen, Tianjie (Department: 2656)
Dynamic magnetic information storage or retrieval
Head
Core
Reexamination Certificate
active
07057853
ABSTRACT:
The disclosed invention provides a magnetic head of high stability in which “erase after write” is prevented. Here is provided a magnetic head comprising a thin-film magnetic head for perpendicular magnetic recording, the thin-film magnetic head including a main pole with its tip facing a magnetic recording medium and coils for exciting the main pole, wherein the tip of or at least a part of the main pole consists of a soft magnetic multilayer containing laminations, each of which comprises a first ferromagnetic film, a second ferromagnetic film, and an antiparallel coupling layer formed between the first ferromagnetic film and the second ferromagnetic film, wherein the antiparallel coupling layer causes antiferromagnetic interlayer coupling of the first ferromagnetic film and the second ferromagnetic film.
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P. Grunberg, J. Barnas, F. Saurenbach, J.A. FuB, A. Wolf and M. Vohl, “Layered magnetic structures: antiferromagnetic type interlayer coupling and magnetoresistance due to antiparallel alignment”, Journal of Magnetism and Magnetic Materials, vol. 93, 1991, pp. 58-66.
Hoshiya Hiroyuki
Kawato Yoshiaki
Okada Yasuyuki
A. Marquez, Esq. Juan Carlos
Chen Tianjie
Fisher Esq. Stanley P.
Hitachi Global Storage Technologies Japan Ltd.
Reed Smith LLP
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