Magnetic recording medium and magnetic storage device

Details Magnetic recording medium and magnetic storage device Magnetic recording medium and magnetic storage device

2005-05-03

2005-05-03

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

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C428S690000, C428S690000, C428S611000, C428S667000, C428S900000

Reexamination Certificate

active

06887565

ABSTRACT:
An inplane magnetic recording medium having high S/N and thermal stability and a reliable magnetic storage device having surface recording density of 50 megabit/mm2or more is described. The magnetic recording medium includes magnetic layers formed on a nonmagnetic substrate with a plurality of ground layers therebetween, at least one of the ground layers formed from an alloy of a body-centered cubic structure containing Cr as a main component and B of from 2 atomic % to 12 atomic %. Main components of the magnetic layers include a lower magnetic layer containing Co and Cr of from 10 atomic % to 16 atomic %, with film thickness of from 1.5 nm to 4.5 nm, and an upper magnetic layer containing Co, coupling anti-ferromagnetically with the lower magnetic layer through nonmagnetic intermediate layers.

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E.N. Abarra, et al., “Longitudinal Magnetic Recording Media with Thermal Stabilization Layers,”Applied Physics Letters(Oct. 16, 2000), 77(16):2581-3.
Eric E. Fullerton, et al., “Antiferromagnetically Coupled Magnetic Media Layers for Thermally Stable High-Density Recording,”Applied Physics Letters(Dec. 4, 2000), 77(23):3806-8.

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