Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2007-02-18
2009-08-11
McNeil, Jennifer (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S827000, C428S831200, C428S832000, C428S829000, C428S830000
Reexamination Certificate
active
07572526
ABSTRACT:
A perpendicular magnetic recording system uses an exchange-spring type of perpendicular magnetic recording medium. The medium has a recording layer (RL) that includes a lower media layer (ML) and a multilayer exchange-spring layer (ESL) above the ML. The high anisotropy field (high-Hk) lower ML and the multilayer ESL are exchange-coupled across a coupling layer. The multilayer ESL has at least two ESLs separated by a coupling layer, with each of the ESLs having an Hksubstantially less than the Hkof the ML. The exchange-spring structure with the multilayer ESL takes advantage of the fact that the write field magnitude and write field gradient vary as a function of distance from the write pole. The thicknesses and Hkvalues of each of the ESLs can be independently varied to optimize the overall recording performance of the medium.
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Berger Andreas Klaus
Fullerton Eric E.
Lengsfield, III Byron Hassberg
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
Katz Vera
McNeil Jennifer
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