Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-01-25
2011-01-25
Bernatz, Kevin M (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S828100, C360S135000
Reexamination Certificate
active
07875371
ABSTRACT:
Embodiments of the invention provide a perpendicular magnetic recording medium improved for fly ability, high in read signal quality, and capable of suppressing magnetic decay of recorded magnetization to be caused by stray fields. In one embodiment, a perpendicular recording layer is formed over a substrate with a soft magnetic underlayer therebetween, then an amorphous or nano-crystalline layer is formed between the substrate and the soft magnetic underlayer. The soft magnetic underlayer includes first and second amorphous soft magnetic layers, as well as a nonmagnetic layer formed between those first and second amorphous soft magnetic layers. The first and second amorphous soft magnetic layers are given uniaxial anisotropy in the radial direction of the substrate respectively and coupled with each other antiferromagnetically.
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Arai Reiko
Honda Yoshinori
Kodama Mineaki
Tanahashi Kiwamu
Bernatz Kevin M
Hitachi Global Storage Technologies - Netherlands B.V.
Zilka-Kotab, PC
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