Magneto-optical recording medium and reproducing method thereof

Abstract

Abstract Translated from Japanese (57)【要約】 【課題】 レンズの開口数や再生光学系のレーザ波長に 関係なく、線記録密度及び径方向の記録密度の高密度化 を可能とし、高記録密度化に十分対応可能とする。 【解決手段】 透明基板１上に希土類金属−遷移金属非 晶質合金よりなり、膜面と垂直方向に磁化容易軸を有す る第１及び第２の光磁気記録膜３，５を第２の誘電体膜 ４を介して積層し、第２の光磁気記録膜５の補償温度を 室温未満とし、このキュリー温度をＴ c2 とし、第１の光 磁気記録膜３の補償温度をＴ comp1 、室温をＴ r とした ときに、Ｔ r ＜Ｔ comp1 ＜Ｔ c2 の関係を有するように し、第２の光磁気記録膜５の膜厚を１５ｎｍ以上とし、 第１の光磁気記録膜３の膜厚を３ｎｍ〜１５ｎｍとし、 第２の誘電体膜４の膜厚を１ｎｍ〜１５ｎｍとする。な お、第２の光磁気記録膜５の室温での磁化を５０ｅｍｕ ／ｃｃ以上とすることが好ましい。 [PROBLEMS] To increase linear recording density and radial recording density irrespective of the numerical aperture of a lens and the laser wavelength of a reproducing optical system, and to be able to sufficiently cope with high recording density. I do. SOLUTION: A first and second magneto-optical recording films 3, 5 made of a rare earth metal-transition metal amorphous alloy and having an easy axis of magnetization in a direction perpendicular to the film surface are formed on a transparent substrate 1 by a second dielectric material. layered with the body membrane 4, the compensation temperature of the second magnetooptical recording film 5 is less than room temperature, the Curie temperature of T c2, the first magneto-optical recording film 3 of the compensation temperature T comp1, room temperature when the T r, to have a relation of T r <T comp1 <T c2 , the thickness of the second magnetooptical recording film 5 not less than 15 nm, The thickness of the first magneto-optical recording film 3 is 3 nm to 15 nm, The thickness of the second dielectric film 4 is set to 1 nm to 15 nm. Note that the magnetization of the second magneto-optical recording film 5 at room temperature is 50 emu. / Cc or more.

Inventors

• 👤 Tetsuhiro Sakamoto
• 👤 哲洋 坂本

Bibliographic Details