Magnetic-optical recording medium

Details Magnetic-optical recording medium Magnetic-optical recording medium

1991-11-20

1995-05-23

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

428694MM, 428900, 369 13, G11B 1110

Patent

active

054180767

ABSTRACT:
A magneto-optical recording medium in which n layers (n is an odd number equal to or more than 5) of magnetic thin film are exchange-coupled to be laminated on a substrate, and assuming that the n layers of magnetic thin film are the first magnetic layer, the second magnetic layer, . . . the n-th magnetic layer in sequence, and the Curie temperature on the i-th magnetic layer is Tc.sub.i, the following conditions are satisfied (where Tc.sub.n+1 is an ambient temperature and m is an arbitrary natural number equal to or less than (n-1)/2).
(1) Tc.sub.2m+1 .gtoreq.Tc.sub.2m, Tc.sub.1 .gtoreq.Tc.sub.2m
(2) Tc.sub.2m .gtoreq.Tc.sub.2(m+1)
(3) In a cooling process after heating the medium to a temperature of Tc.sub.2 or more, when the temperature of the (2m)-th magnetic layer drops down to a temperature near Tc.sub.2m, the magnetization of the (2m)-th and (2m+1)-th magnetic layers orients to the (2m-1)-th magnetic layer so that the bonding state due to exchange interaction may be stable, while the magnetization on the (2m-1)-th magnetic layer retains its immediately previous orientation state.

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