Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2006-07-25
2006-07-25
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S829000
Reexamination Certificate
active
07081309
ABSTRACT:
A magnetic recording disk has an antiferromagnetically-coupled (AFC) structure that has an upper ferromagnetic layer (UL), and a lower ferromagnetic layer structure formed of two ferromagnetically-coupled lower layers (LL1, LL2). The UL is antiferromagnetically-coupled to the lower layer structure across an antiferromagnetically-coupling layer. LL1and LL2are ferromagnetically coupled across a ferromagnetic coupling layer so the magnetizations of LL1and LL2remain parallel in each remanent magnetic state, but are antiparallel to the magnetization of the UL in each remanent magnetic state. The UL has an Mrt greater than the sum of the Mrt values of LL1and LL2.
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Do Hoa Van
Fullerton Eric Edward
Margulies David
Moser Andreas
Bernatz Kevin M.
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
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