Magnetic recording medium having a metal underlayer and a CoCr a

Details Magnetic recording medium having a metal underlayer and a CoCr a Magnetic recording medium having a metal underlayer and a CoCr a

1995-04-26

1998-08-04

Resan, Stevan A.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428667, 428668, 428694T, 428694TS, 428457, 428900, G11B 564

Patent

active

057890889

ABSTRACT:
Disclosed is magnetic recording media having a high coercivity sufficient to cope with the recent high density recording, low noise property and excellent squareness, and a target for forming a magnetic film useful for realizing the magnetic recording media. The magnetic film is made of a Co based alloy containing: Cr in an amount of 8-18 atomic %; one kind or more of elements selected from a group consisting of V, Mo and W in an amount of 3-10 atomic %, or one kind or more of the elements and Ta in an amount of 3-10 atomic %; Pt in an amount of 0.5 to 20 atomic % or Ni in an amount of 5-30 atomic %, as needed; and the balance being Co and inevitable impurities, wherein the total content of Cr and one kind or more of the elements selected from a group consisting of V, Mo and W, or of Cr and one kind or more of the elements and Ta is specified to be 24 atomic % or less. A target for forming the magnetic film is formed by melting, casting and hot-rolling the Co alloy having the above composition, and it has a maximum permeability of 100 or less.

REFERENCES:
patent: 5143794 (1992-09-01), Suzuki et al.
patent: 5147734 (1992-09-01), Nakamura et al.
patent: 5334267 (1994-08-01), Taniguchi et al.
patent: 5352501 (1994-10-01), Miyamoto et al.
patent: 5422072 (1995-06-01), Mitsuhashi et al.

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