Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2007-11-27
2007-11-27
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S827000, C427S131000
Reexamination Certificate
active
10976557
ABSTRACT:
A thin film disk for use in magnetic recording with an underlayer structure that includes a layer of CrMoZr, CrMoNb or CrMoMn is described. The preferred embodiment includes a circumferentially textured glass substrate, a pre-seed layer, a B2 seed layer, an underlayer structure and a magnetic layer stack with a plurality of layers. The preferred underlayer structure has a first underlayer of CrTi followed by a second underlayer of CrMoZr. The preferred B2 seed layer material is RuAl. The preferred pre-seed layer is CrTiAl. The preferred magnetic layer stack is CoCr/CoPtCrB/CoPtCrBCu. The preferred embodiment is useful for longitudinal magnetic recording. The in-plane crystallographic orientation, the Mrt orientation ratio and the media SNR are improved by the inclusion of the CrMoZr, CrMoNb or CrMoMn according to the invention.
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Bian Xiaoping
Chang Jack
Marinero Ernesto E.
Mirzamaani Mohammad
Hitachi Global Storage Technologies - Netherlands B.V.
Knight G. Marlin
Rickman Holly
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