Magnetic recording medium and magnetic recording and...

Details Magnetic recording medium and magnetic recording and... Magnetic recording medium and magnetic recording and...

2011-07-12

2011-07-12

Bernatz, Kevin M (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S829000, C428S830000, C428S836200, C360S133000

Reexamination Certificate

active

07976965

ABSTRACT:
A magnetic recording medium comprises a nonmagnetic substrate on which is disposed at least a vertical magnetic layer. The vertical magnetic layer comprises at least three layers including a lower layer, an intermediate layer and an upper layer from the substrate side. The lower, intermediate and upper magnetic layers are bound by ferro-coupling and are constituted of magnetic particles which are columnar crystals extending continuously from the lower layer to the upper layer. A nonmagnetic layer is between the lower and intermediate magnetic layers or between the intermediate and upper magnetic layers. The upper layer has a magnetic anisotropic constant (Ku) from 0.8×106to 4×106(erg/cc), the intermediate layer has a magnetic anisotropic constant (Ku) from 2×106to 7×106(erg/cc) and the lower layer has a magnetic anisotropic constant (Ku) from 1×106to 4×106(erg/cc).

REFERENCES:
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patent: 2008/0180843 (2008-07-01), Zhang et al.
patent: 2005-276410 (2005-10-01), None

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