Magnetic recording medium having novel underlayer structure

Details Magnetic recording medium having novel underlayer structure Magnetic recording medium having novel underlayer structure

2007-02-20

2007-02-20

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C427S131000

Reexamination Certificate

active

10761820

ABSTRACT:
A magnetic recording medium constructed in accordance with the invention comprises a substrate, first, second and third underlayers formed over the substrate, and a magnetic data recording layer formed over the underlayers. The underlayers typically have a bcc crystal structure, and comprise Cr or Cr alloys. The magnetic data recording layer has a hcp crystal structure and comprises a Co alloy. The second underlayer typically comprises a material such as B, which tends to reduce the crystal size of the second underlayer and the layers deposited thereon, and also to increase crystal spacing.

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Yu et al., “High Density Recording Media with CrMoB Underlayer”.

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