Antiferromagnetically coupled (AFC) media with flash CR...

Details Antiferromagnetically coupled (AFC) media with flash CR... Antiferromagnetically coupled (AFC) media with flash CR...

2007-07-03

2007-07-03

Rickman, Holly (Department: 1773)

Coating processes

Magnetic base or coating

Magnetic coating

C428S828000

Reexamination Certificate

active

10997538

ABSTRACT:
A disk for a hard disk drive. The disk includes a S1 layer of magnetic material located over a substrate, and a layer of ruthenium located over the S1 layer. The disk further includes a top layer of magnetic material and a layer of chromium located adjacent to the top magnetic layer. The chromium diffuses into the top layer of magnetic material to magnetically decouple the grains of the magnetic material. Decoupling the grains of the magnetic material reduces the magnetic noise of the disk and improves the signal to noise ratio of the hard disk drive.

REFERENCES:
patent: 6372330 (2002-04-01), Do et al.
patent: 2002/0127433 (2002-09-01), Shimizu et al.

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