Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1998-05-04

2000-07-11

Jones, Deborah

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428694MM, 428694EC, 428694MT, 428694RE, 369 13, 369288, B32B 1501, B32B 1518, G11B 1110, G11B 566

Patent

active

060869933

ABSTRACT:
A magneto-optical recording medium capable of direct overwriting in a light intensity modulation mode comprises a magnetic multilayer structure comprising, in order form an surface side thereof, a readout layer R.sub.01, a memory layer M.sub.1, an exchange force control layer C.sub.12 and a recording layer W.sub.2, four layers in all. The magnetic multilayer structure satisfies TC.sub.W2 >Tc.sub.M1, t.sub.R01 /(t.sub.R01 +t.sub.M1)=0.3 to 0.6, and t.sub.R01 +t.sub.M1 =20 to 40 nm where Tc.sub.M1 is a Curie temperature of M.sub.1, Tc.sub.W2 is a Curie temperature of W.sub.2, t.sub.R01 is a thickness of R.sub.01, and t.sub.M1 is a thickness of M.sub.1. R.sub.01 contains Gd, Fe, and Co as main components with the proviso that Gd is contained in an amount of 23 to 27 at %, M.sub.1 contains Tb, Fe, and Co as main components with the proviso that Tb is contained in an amount of 21 to 25 at %, and C.sub.12 contains Gd, Fe, and Co as main components with the proviso that Gd is contained in an amount of 23 to 32 at %, and has a thickness of 30 nm or below.

REFERENCES:
patent: 5241520 (1993-08-01), Ohta et al.
patent: 5353171 (1994-10-01), Suzuki et al.
patent: 5389455 (1995-02-01), Saito
patent: 5428585 (1995-06-01), Hirokane et al.
patent: 5740133 (1998-04-01), Tamanoi et al.
patent: 5889740 (1999-03-01), Nakayama et al.

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