Apparatus using amorphous magnetic compositions

Details Apparatus using amorphous magnetic compositions Apparatus using amorphous magnetic compositions

1975-05-27

1976-06-22

Moffitt, James W.

Communications: electrical

Digital comparator systems

340174YC, G11C 1114

Patent

active

039654630

ABSTRACT:
Apparatus using amorphous magnetic compositions having uniaxial anisotropy include bubble domain apparatus, light modulating apparatus, permanent magnet systems, and tape and disc information handling systems. The amorphous magnetic composition can be prepared in thin film or bulk form or as particles in a binder. The anisotropy can be parallel to the plane of a film of this material or perpendicular to the film plane. The amorphous material is comprised of a single element or is a multicomponent system where as at least one of the components has an unimpaired spin so that the composition has a net magnetic moment. The amorphous composition exists as a microcrystalline structure having localized atomic ordering over a distance 25-100 A, or as a substantially amorphous structure where localized atomic ordering is over distances less than 25A. Binary and ternary compositions, either alloys or compounds, are suitable. The magnetic properties of the compositions can be changed during fabrication or after fabrication, and the compositions can be doped readily without adversely affecting magnetic properties.

REFERENCES:
patent: 3736579 (1973-05-01), Marsh
IEEE Transaction on Magnetics, vol. 8, Mag-8, No. 1, Mar. 1972, pp. 105-130.
Journal of Applied Physics, vol. 42, No. 1, Jan. 1971, pp. 367-375.

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