Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1992-01-14
1992-09-01
Nguyen, Hoa
Stock material or miscellaneous articles
Composite
Of inorganic material
428900, 3692752, 369288, 369 13, 365122, 365 34, G11B 1112, G11B 1110, G11B 1304, G11B 566
Patent
active
051437988
ABSTRACT:
A magneto-optical recording medium including a first magnetic layer (having film thickness t1 and saturation magnetization Ms1) and a second magnetic layer (having film thickness t2 and saturation magnetization Ms2) which are respectively made from a rare earth-transition metal alloy and sequentially laminated on a substrate to jointly make up a recording layer. Only the first magnetic layer or both the first and second magnetic layers contain a light rare earth element. At room temperature, a transition-metal sub-lattice magnetic moment is dominant in the first magnetic layer, whereas a rare earth sub-lattice magnetic moment is dominant in the second magnetic layer, respectively. Substantially, the directions to stabilize magnetization of the first and second magnetic layers are inverse from each other and the expression shown below is satisfied.
REFERENCES:
patent: 4293621 (1981-10-01), Togami
patent: 4518657 (1985-05-01), Yanagida
patent: 4556291 (1985-12-01), Chen
patent: 4799114 (1989-01-01), Tsunashima
patent: 4878132 (1989-10-01), Aratani et al.
patent: 4955007 (1990-09-01), Aratani et al.
patent: 5094925 (1992-03-01), Ise et al.
Exchange-Coupled Double-Layer Tb-Fe-Co Films for Magneto-Optical Memory Fujii, et al.--J. Magn. Soc. Jpn., 11, Suppl., No. S1, 1987, pp. 329-332.
High Performance Magneto-Optical Disks Using Double Layered Tb-Fe-Co Films H. Sugahara, et al. IEEE Trans. Magn., 24, No. 6, 1988, pp. 2455-2457.
Recording Characteristics of Double-Layered TbFeCo Disk T. Tokunaga, et al. IEEE Trans. J. Magn. Jpn., 4 No. 5, 1989, pp. 278-282.
Magneto-Optical and Magnetic Properties of Exchange-Coupled TbNdFeCo Films Fujii, et al. Tech. Digest Magneto-Optical . . . symposium Apr. 1991, p. 34.
Stability of Small bits Written in Amorphous GdCo Thin Films Togami, Appl. Phys. Lett. 32, (10), May 15, 1978, pp. 673-675.
Magnetization Process of Exchange-Coupled Ferrigmagnetic Double-Layered Films Kobayashi, et al. Jpn. J. of Appl. Phys. 20, No. 11, Nov. 1981, pp. 2089-2095.
Theromagnetic Writing on Exchange-Coupled Amorphous Rare-Earth Iron . . . Tsunashima, et al. IEEE Trans. magn. MAG-17, No. 6, Nov. 1981, pp. 2840-2842.
Beam Addressable High-Densith Magnetic Record Film GH May IBM Technical Disclosure Bulletin 16, No. 7 Dec. 1973, pp. 2365-2366.
Magneto-Optical Characteristics of Double-Layered Amorphous RE-Fe Films By . . . Takenouchi et al. J. Appl. Phys., 55(6), Mar. 15, 1984, pp. 2164-2166.
Tbx Ndx (FeCo) 1-x-y: Promising Materials for Magneto-Optical Storage? Reim, et al. J. Appl. Phys., 61(8), Apr. 15, 1987, pp. 3349-3351.
Magneto-Optical Media with High Kerr Fotation at Short Wavelengths Iiyori, et al. Tech. digest: symposium Apr. 1991: (paper to be published) (17-R-02), p. 79.
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Hoa
LandOfFree
Magneto-optical recording medium having double magnetic layers i does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magneto-optical recording medium having double magnetic layers i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-optical recording medium having double magnetic layers i will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-766947