G - Physics – 11 – B
Patent
G - Physics
11
B
352/33.3
G11B 11/14 (2006.01) G11B 11/105 (2006.01)
Patent
CA 2029951
A magneto-optic recording medium comprises: a 1st layer having a Curie temp. Tc1, having a perpendicular magnetic anisotropy, a 2nd layer, being a transition metal sublattice dominant film, having a Curie temp. Tc2, provided on the 1st layer and exchange coupled with the 1st layer, a 3rd layer having a Curie temp. Tc3, provided on the 2nd layer and exchange coupled with the 2nd layer, and a 4th layer having a Curie temp. Tc4, provided on the 3rd layer and exchange coupled with the 3rd layer, wherein Tc2 > Tc1, Tc4 > Tc1, Tc2 > Tc3, and Tc4 > Tc3. The magnetization of the 1st layer is not reversed due to the magnetization of the 2nd layer at room temp.; the directions of the sublattice magnetization of the 2nd layer, the 3rd layer and the 4th layer are parallel with each other at room temp. after recording operation; and there is a temp. between room temp. and the lower one of the Curie temp. of the 1st layer and Tc3 at which the relationship: Hc2 < Hw2 is satisfied. Here, Hc2 and Hw2 respectively represent the coercivity of the 2nd layer, and the exchange coupling which the 2nd layer receives from the 1st and 3rd layers. Hc2 and Hw2 are values obtained when the four layers are stacked with each other and the sublattice magnetizations of the 1st and 3rd layers are antiparallel with each other.
Fukami Tatsuya
Nakaki Yoshiyuki
Taguchi Motohisa
Tokunaga Takashi
Tsutsumi Kazuhiko
Mitsubishi Denki Kabushiki Kaisha
Riches Mckenzie & Herbert Llp
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