Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1997-09-17
1999-05-11
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
428694MM, G11B11/00
Patent
active
059035269
ABSTRACT:
Magneto-optic recording medium has at least a 1st magnetic layer for recording information signals, a 2nd magnetic layer formed on the 1st magnetic layer and a 3rd magnetic layer formed on the 2nd magnetic layer. The 1st and 3rd magnetic layers are made of a first amorphous material of rare earth and 3d transition metal having perpendicular magnetic anisotropy in a direction perpendicular to a surface thereof, respectively. The 2nd magnetic layer is interposed between the 1st and 2nd magnetic layers as an intermediate layer. The 2nd magnetic layer is made of a second amorphous material of rare earth metal and 3d transition metal with rare earth metal rich (RE-rich) having a smaller exchange energy between the rare earth metal and a 3d transition metal than that of Gd--Fe or Gd--Fe--Co and having magnetic anisotropy in a direction parallel to a surface of the 2nd magnetic layer, wherein the 1st and the 3rd magnetic layers are magnetically coupled through the 2nd magnetic layer.
REFERENCES:
patent: 5629908 (1997-05-01), Hirokane et al.
patent: 5679455 (1997-10-01), Nakaki et al.
Japanese Journal of Applied Physics, 20(11), 2089-2095 Aug. (1981) "Magnetization Process . . . ", T. Kobayashi et al.
J. Appl.Phys., 50(11), 7471-7476 Nov. (1978) "Magnetic and Magneto-Optic Properties . . . " P. Hansen, et al.
IEEE Transactions on Magnetics vol. MAG-16(5), 1188-1193 Sep. (1980) "Magnetic, Magneto-Optic and Switching . . . " M. Urner-Wille, et al.
Dinh Tan
Meller Michael N.
Victor Company of Japan Ltd.
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