Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1997-04-16
1999-08-31
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428694MM, 428694EC, 428900, 369 13, 369 14, 369110, 369112, 369283, 369284, 369286, 360114, G11B 566
Patent
active
059452285
ABSTRACT:
A magneto-optical recording medium comprises: a readout magnetic film which is perpendicular magneto-anisotropy in a temperature range higher than room temperature and less than a second temperature Tsw2, and is in-plane magneto-anisotropy in a temperature range equal to or more than the second temperature Tsw2; an intermediate magnetic film which is in-plane magneto-anisotropy in a temperature range higher than the room temperature; and a recording magnetic film which is perpendicular magneto-anisotropy for holding recording magnetic domains. When the coercive force of the readout magnetic film is Hc, the exchange coupled force between the readout magnetic film and the recording magnetic film is Hs, and the readout magnetic field is Hr, in a temperature range equal to or higher than room temperature and less than a first temperature Tsw1 which is higher than room temperature and is lower than the second temperature Tsw2, a first relation .vertline.Hr.vertline.>.vertline.Hs+Hc.vertline. is satisfied, and in a temperature range from the first temperature Tsw1 to the second temperature Tsw2, a second relation .vertline.Hr.vertline.<.vertline.Hs.vertline.-.vertline.Hc.vertline. is satisfied.
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patent: 5463578 (1995-10-01), Gambino et al.
patent: 5503924 (1996-04-01), Osato
Masumi Ota et al., "Development of a magneto-optical disk, realizing more than double high density regeneration with an existing optical system," Nikkei Electronics, p. 223 ff, Oct. 28, 1991.
Kiliman Leszek
Matsushita Electric - Industrial Co., Ltd.
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