Large capacity magnetic disc apparatus with a particular relatio

Details Large capacity magnetic disc apparatus with a particular relatio Large capacity magnetic disc apparatus with a particular relatio

1995-03-06

1997-09-23

Evans, Jefferson

Dynamic magnetic information storage or retrieval

Head

Core

360 9801, 360103, G11B 5012, G11B 531, G11B 560

Patent

active

056711077

ABSTRACT:
A magnetic disc apparatus has a large recording density of 120 megabits per square inch or more, and defines a relationship among a pole thickness (Pt) of thin-film magnetic heads disposed in the magnetic disc apparatus, and a saturation flux density (Bs) of cores of the heads and a recording wavelength (.lambda.) for the thin film magnetic discs have a coercivity of 1800 Oe or more, wherein a levitation space between the head and the disc is 0.15 .mu.m or less.

REFERENCES:
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patent: 5134038 (1992-07-01), Baseman et al.
patent: 5218497 (1993-06-01), Tanabe et al.
patent: 5278712 (1994-01-01), Sugaya
J. Appl. Phys. 61(8) 15, Apr. 1987; pp. 4157-4162 4. "Design and fabrication of thin-film head based on . . . ".
IEEE Transactions on Magnetics, vol.25, No.5, Sep., 1989, pp. 3194-3196.
IEE Transactions on Magnetics, vol.215, No.5, Sep., 1989, pp. 3683-3685.
Journal of Applied Physics 61(8), 15 Apr. 1987, pp. 4182-4184.
Perpendicular . . . Density, Katz et al., Computer Library Periodicals, Jan. 1989, Doc. #34660.
Computergram International, Nov. 1989, Rec# 07864486.

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