Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Patent
1987-05-15
1989-01-17
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
360135, G11B 502
Patent
active
047991143
ABSTRACT:
A new thermomagnetic recording medium is presented. The medium comprises a substrate and a pair of layers, one of which is comprised essentially of Gd-alloys. A layer wherein Gd-alloys is used exchange couples with another layer having higher coercive force, where both layers possess perpendicular anisotropy, and different Curie Points. The medium possesses a high Signal/Noise ratio, and maintains information stored therein for long periods of time.
REFERENCES:
patent: 3394360 (1968-07-01), Miyara
patent: 3701133 (1972-10-01), Smaller et al.
patent: 3949387 (1976-04-01), Chaudhari et al.
patent: 4152486 (1979-05-01), Imamura et al.
patent: 4202022 (1980-05-01), Imamura et al.
patent: 4293621 (1981-10-01), Togami
patent: 4340914 (1982-07-01), Hanaoka
patent: 4347112 (1982-08-01), Togami
patent: 4351010 (1982-09-01), Arai
"Beam Addressable High-Density Magnetic Record File" by G. H. May, JBM TDB vol. 16 #7, 12/73.
S. Tsunashima, H. Tsumi, T. Kobayashi and S. Uchiyama, "Thermomagnetic Writing on Multilayered Amorphous Rare-Earth Iron Films", J. Magnetics Soc'y. Japan, vol. 5, No. 2, 1981.
T. Kobayashi, H. Tsuji, S. Tsunashima and S. Uchiyama, "Magnetization Process of Exchange-Coupled Ferrimagnetic Double-Layered Films", Japanese J. Applied Physics, vol. 20, No. 11, Nov. 1981.
S. Tsunashima, H. Tsuji, T. Kobayashi and S. Uchiyama, "Thermomagnetic Writing on Exchange-Coupled Amorphous Rare-Earth Iron Double-Layer Films", IEEE Transactions on Magnetics, vol. MAG-17. No. 6, Nov. 1981.
A. Nodo, T. Kobayashi, S. Tsunashima and S. Uchiyama, "Thermomagnetic Writing and Erasing Characteristics of Exchange-Coupled Amorphous Rare-Earth Iron Double-Layered Film", J. Magnetics Soc'y. Japan, vol. 6, No. 2, 1982.
Y. Togami, "Stability of Small Bits Written in Amorphous Gd-Co Thin Films" Appl. Phys. Lett. vol. 32, No. 10, May 15, 1978.
W. H. Meiklejohn, "New Magnetic Anisotropy", Physical Review, vol. 102, No. 5, Jun. 1, 1956 pp. 1413, 1414.
H. Uchishiba, H. Tominaga, T. Namikata and S. Sakai, "Internal Bias Effect of Double Layer Epitaxial Garnet Films", IEEE Transactions on Magnetics, vol. MAG-9, No. 3, Sep. 1973.
K. Y. Ahn and G. S. Almasi, "Coupling Effects Between Films of Fe and EuO" IEEE Transactions on Magnetics, vol. MAG-5, No. 4, Dec. 1969.
O. Massenet, "Coupling in Multilayered Magnetic Films", IEEE Transactions on Magnetics, vol. MAG-4, No. 1, Mar. 1968.
W. P. Lee and D. A. Thompson, "An Exchange-Coupled Thin-Film Memory Device", IEEE Transactions on Magnetics, vol. MAG-4, No. 3, Sep. 1968.
J. C. Bruyere and O. Massenet, "Application of Coupled Films to Memory Elements" IEEE Transactions ON Magnetics, vol. 5, No. 3, Sep. 1969.
G. S. Almasi and E. R. Genovese, "Nonvolatile Magneto-Optical Memory Element", IBM Technical Disclosure Bulletin vol. 14, No. 1, Jun. 1971, p . 342.
H. Tsujimoto, D. P. Shen, S. Matsushita and Y. Sakurai, "Magnetic Properties of Multilayered Amorphous Magnetic Films", IEEE Transaction on Magnetics, vol. MAG-16, No. 5, Sep. 1980, pp. 1209-1211.
R. C. Taylor and A. Gangulee "Magnetic Anisotropy in Evaporated Amorphous Films of the Ternary System Gd.sub.x (Fe.sub.1-y Co.sub.y)1-x", J. Applied Physics vol. 48, No. 1, Jan. 1977, pp. 358-361.
A. M. Balbashov, N. D. Baikova, A. P. Gubarev, S. N. Marchenko, A. Ya. Chervonenkis, and A. A. Shimko "Thermomagnetic Recording in a Structure Consisting of a Film of a Garnet Containing Bi and MnBi Film", Soviet Technical Physics Letters 3 (12), Dec. 1977, pp. 529-530.
A. M. Balbashov, A. P. Gubarev and A. Ya. Ghervonenkis "Thermomagnetic Recording in Two-Layer Magnetic Structure" Soviet Technical Physics Letters 49, No. 11, Nov. 1979, pp. 1349-1350.
O. S. Lutes, J. O. Holmen, R. L. Kooyer and O. S. Aadland, "Inverted and Biased Loops in Amorphous Gd-Co Films", IEEE Transactions on Magnetic vol. MAG-13, No. 5, Sep. 1977, pp. 1615-1617.
M. Amatsu, S. Honda and T. Kusuda, "Anamalous Hysteresis Loops and Domain Observation in Gd-Fe Co-Evaporated Films", IEEE Transactions on Magnetics vol. MAG-13, No. 5, Sep. 1977, 1612-1614.
Sotaro Esho "Anomalous Magneto-Optical Hysteresis Loops of Sputtered Gd-Co Films", Japanese J. Applied Physics (Supplement) vol. 15, 1976, pp. 93-98.
Y. Mimura, N. Imamura, T. Kobayshi, A. Okada and Y . Kushiro "Magnetic Properties of Amorphous Alloy Films" of Fe with Gd, Tb, Dy, Ho, or Er, J. Applied Physics, vol. 49, No. 3, Mar. 1978, pp. 1208-1214.
Y. Mimura, N. Imamura and T. Kobayashi, "Kerr Readout Characteristics of Gd-Fe, Tb-Fe and Dy-Fe Amorphous Alloy Films" Japanese J. Applied Physics, vol. 17, No. 11, Nov. 1978, pp. 2007-2012.
M. J. Freiser, "A Survey of Magneto-Optic Effects", IEEE Transactions on Magnetics, vol. MAG-4, No. 2, Jun. 1968, pp. 152-161.
Canney Vincent P.
Canon Kabushiki Kaisha
Daidotokushuko Kabushiki Kaisha
LandOfFree
Thermomagnetic recording carrier and a method for thermomagnetic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermomagnetic recording carrier and a method for thermomagnetic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermomagnetic recording carrier and a method for thermomagnetic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2415428