Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1997-09-03
2000-07-04
Kiliman, Leszek
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 657, 428694R, 428694T, 428694TS, 428694TM, 428336, 428900, 360113, 360128, G11B 566
Patent
active
060835990
ABSTRACT:
A perpendicular magnetic recording medium is provided by using a ferromagnetic polycrystalline thin film having main components of cobalt and chromium in which the coercivity is 1500 oersted or more and the fluctuation field of magnetic viscosity is 30 oersted or more; the film thickness is controlled within a range from 30 nm to 100 nm. A perpendicular magnetic recording medium with low noise and high output which is suited for high density recording can be obtained and a large capacity magnetic recording and reproducing apparatus can be provided by using this medium.
REFERENCES:
patent: 5686177 (1997-11-01), Yamanaka
Masayoshi Shinohara, Journal of Magnetism and Magnetic Materials 134(1994) 304-309, "High SNR perpendicular recording media".
E P Wohlfarth, J. Phys.F:Met.Phys.14(1984) L155-L159, Printed in Great Britain, "The coefficient of magnetic viscosity".
K. Yamanaka et al., Journal of Magnetism and Magnetic Materials 127(1993) 233-240, "Magnetic viscosity of oriented barium ferrite media".
Futamoto Masaaki
Hirayama Yoshiyuki
Honda Yukio
Ito Kenya
Yamanaka Kazusuke
Hitachi , Ltd.
Kiliman Leszek
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