Chemistry: electrical and wave energy – Processes and products – Coating – forming or etching by sputtering
Patent
1998-07-09
1999-07-13
Kiliman, Leszek
Chemistry: electrical and wave energy
Processes and products
Coating, forming or etching by sputtering
2041922, 20429812, 20429813, 20429823, 360 59, 360114, 365122, 369 13, 3692752, 427128, 427129, 427130, 427131, C23C 1400, C23C 1432
Patent
active
059221771
ABSTRACT:
A method to produce a magneto-optical recording medium which includes a readout layer having in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to a perpendicular magnetization when temperature rises, and a recording layer for storing information thereon magneto-optically. In the readout layer made of GdFeCo by adding Nd thereto, an amount of Nd to be added changes in a direction perpendicular to its film surface, and an amount of Nd is larger on a light incidence side than on the other side. As a result, even when a laser with a short wavelength is used, high density recording can be achieved as undesirable recording and reproducing operations due to a change in a magnetic interaction is prevented and also deterioration in quality of a reproducing signal is prevented.
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Iketani Naoyasu
Murakami Yoshiteru
Ohta Kenji
Takahashi Akira
Buckley Linda M.
Conlin David G.
Kiliman Leszek
Sharp Kabushiki Kaisha
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