Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1999-04-19
2000-10-03
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
428694MM, G11B 1100
Patent
active
061282545
ABSTRACT:
A magneto-optical recording medium composed of a plurality of magnetic layers including a rare earth metal and a transition metal as main components. The magneto-optical recording medium includes a magnetic reproducing layer having an easy axis of magnetization perpendicular to a film plane, and a magnetic control layer formed over the magnetic reproducing layer and having an easy axis of magnetization in a plane at a room temperature. A magnetic moment of the rare earth metal of the magnetic control layer being predominant over a magnetic moment of the transition metal of the magnetic control layer. The magnetic control layer includes at least Gd as the rare earth metal and Fe as the transition metal. The magneto-optical recording medium further includes a magnetic recording layer formed over the magnetic control layer and having an easy axis of magnetization perpendicular to the film plane. A Curie temperature Tc1 of the magnetic reproducing layer, a Curie temperature Tc2 of the magnetic control layer, and a Curie temperature Tc3 of the magnetic recording layer are related to satisfy Tc1>Tc2 and Tc3>Tc2. A coercive force Hc1 of the magnetic reproducing layer at the room temperature and a coercive force Hc3 of the magnetic recording layer at the room temperature are related to satisfy Hc3>Hc1.
REFERENCES:
patent: 4908809 (1990-03-01), Tadokoro et al.
patent: 5016232 (1991-05-01), Tadokoro et al.
patent: 5142513 (1992-08-01), Takehara et al.
patent: 5367509 (1994-11-01), Fukumoto et al.
patent: 5481410 (1996-01-01), Osato et al.
patent: 5486395 (1996-01-01), Murakami et al.
patent: 5539709 (1996-07-01), Sato et al.
patent: 5681633 (1997-10-01), Onagi et al.
patent: 5787056 (1998-07-01), Nakayama et al.
patent: 5821004 (1998-10-01), Hino et al.
patent: 5889740 (1999-03-01), Nakayama et al.
Matsumoto Koji
Shono Keiji
Dinh Tan
Fujitsu Limited
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