Magnetic recording medium containing heavy rare gas atoms, and a

Details Magnetic recording medium containing heavy rare gas atoms, and a Magnetic recording medium containing heavy rare gas atoms, and a

1995-01-30

1997-07-22

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360135, G11B 5012, G11B 582

Patent

active

056508891

ABSTRACT:
A magnetic recording medium having a high coercivity and a high S/N ratio for high-density operation can include either a conductive or a nonconductive substrate. If the substrate is nonconductive, a conducting precoat layer is formed over the substrate. Further, an underlayer may be provided, over which a magnetic layer is formed by a bias sputtering method. The bias sputtering method may use Kr, Xe or Rn as a sputter gas, and employs a negative bias voltage. The magnetic recording medium has a product of remanent magnetization and magnetic layer thickness of 10-150 G.multidot..mu.m and a coercivity of 1600-4000 Oe. In combination with this magnetic recording medium, a large-capacity magnetic recording system has a write head that uses a magnetic material having a saturation magnetic flux density of more than 1.2 T in at least a part of the magnetic core; a read head utilizing the giant magnetoresistance effect; a signal processing circuit that utilizes maximum likelihood decoding; and circuits that correct for asymmetry of the reproduced signals from the magnetoresistive head. In addition, the flying height of the magnetic head slider is set to less than 0.05 .mu.m.

REFERENCES:
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patent: 5434014 (1995-07-01), Kanamaru
N. Tani et al, "Increase of Coercive Force in Sputtered Hard Disk", IEEE Transactions on Magnetics, vol. 26, No. 4, Jul. 1990, pp. 1282-1285.
H. Murata et al, "Magnetic Properties and Microstructure of CoCrTa/Cr Magnetic Recording Media", Journal of the Japan Applied Magnetics Society, vol. 16, 1992, pp. 541-546.
Y. Deng et al, "Structural Characteristics of Bias Sputtered CoCrTa/Cr Films", Digest of Intermag Conference, Apr. 13-16, 1993, p. EB-04.
H. Yoshimoto et al, "Recording Characteristics of Co-Cr-Ta Perpendicular Magnetic Recording Tape a Short Wavelength", Journal of the Japan Applied Magnetics Society, vol. 17, supplement, No. S2, 1993, pp. 125-130.

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