Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-01-04
2011-01-04
Bernatz, Kevin M. (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S827000, C428S828000
Reexamination Certificate
active
07862912
ABSTRACT:
A perpendicular magnetic recording medium, usable for either continuous or patterned media, has a recording layer structure (RLS) of first and second perpendicular magnetic layers (PM1, PM2) and an antiferromagnetically coupling (AFC) layer and a ferromagnetic switching layer (SWL) between PM1and PM2. The magnetic recording system uses heat to assist in the reading and/or writing of data. The SWL is a Co/Ni multilayer with a Curie temperature (TC-SWL) less than the Curie temperatures of PM1and PM2. At room temperature, there is ferromagnetic coupling between SWL and the upper ferromagnetic layer (PM2) so that the magnetizations of SWL and PM2are parallel, and antiferromagnetic coupling between SWL and the lower ferromagnetic layer (PM1) across the AFC layer so that the magnetization of PM1is aligned antiparallel to the magnetizations of SWL and PM2. When the SWL is heated to above TC-SWLit is no longer ferromagnetic, there is no antiferromagnetic coupling between the SWL and PM1across the AFC layer, and the magnetizations of PM1and PM2become aligned parallel.
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Hellwig Olav
Terris Bruce David
Thiele Jan-Ulrich
Bernatz Kevin M.
Berthold Thomas R.
Harris Gary
Hitachi Global Storage Technologies - Netherlands B.V.
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