Magnetic recording medium with Cr underfilm

Details Magnetic recording medium with Cr underfilm Magnetic recording medium with Cr underfilm

2005-04-12

2005-04-12

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

C428S636000, C428S664000, C428S666000, C428S668000, C428S686000, C428S215000, C428S216000, C428S336000, C428S409000, C428S690000

Reexamination Certificate

active

06878459

ABSTRACT:
A magnetic recording medium was a high normalized coercive force and superior thermal stability. The magnetic recording medium comprises a non-magnetic base material, and a ferromagnetic metal layer of cobalt based alloy formed on top of this base material with a metal underlayer disposed therebetween, and displays a coercive force Hc of at least 2000 (Oe) and an anisotropic magnetic field Hkgrainof at least 10,000 (Oe). Furthermore, magnetic recording media in which the aforementioned metal underlayer and/or the ferromagnetic metal layer are fabricated in a film fabrication chamber with an ultimate vacuum at the 10−9Torr level are preferred. A magnetic recording medium according to the present invention can be ideally applied to hard disks, floppy disks, and magnetic tapes and the like.

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