Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1984-09-21
1987-02-24
Lesmes, George F.
Stock material or miscellaneous articles
Composite
Of inorganic material
365122, 360131, 360135, 428900, 428928, G11B 724
Patent
active
046457224
ABSTRACT:
A recording medium suitable for use in a photo-thermo-magnetic memory of high density recording, including a substrate; a first magnetic layer, such as an amorphous TbFe film, which has a large coercive force and whose axis of easy magnetization is oriented in the direction perpendicular to the surface of the first layer; and a second magnetic layer, such as an amorphous GdTbCoFe film, having (i) a larger polar Kerr rotation or reflection than that of the first layer, (ii) the same polarity of polar Kerr rotation as that of the first layer, (iii) a direction of its magnetic moment aligned in parallel with that of the first layer and (iv) a thickness permitting the transmittance of a light, such as laser beam, therethrough and being magnetically coupled with the first layer by an exchange interaction therebetween; the first and second magnetic layers being superimposed on the substrate in that order or in the inverse order. Such a recording medium can be suitably prepared by re-sputtering or ion-bombardment techniques.
REFERENCES:
patent: 4347112 (1982-08-01), Togami
patent: 4497006 (1985-01-01), Deguchi et al.
patent: 4518657 (1985-05-01), Yanagida
Taylor et al, "Magnetic Anisotropy in Evaporated Amorphous Films of the Ternary System Gd(FeCo)", J. App. Phy., 48(1), 358, (1977).
Almasi et al, "Nonvolatile Magneto-Optical Memory Element," IBM TDB, vol. 14(1), Jun. 1971, p. 342.
Arimune Hisao
Katayama Toshikazu
Shibata Tsugio
Atkinson William M.
Director-General of Agency of Industrial Science & Technology
Kyocera Corp.
Lesmes George F.
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