Hollow magnetic domain recording device

Details Hollow magnetic domain recording device Hollow magnetic domain recording device

1975-06-30

1977-01-18

Moffitt, James W.

Communications: electrical

Digital comparator systems

G11C 1114

Patent

active

040042871

ABSTRACT:
A recording device in which hollow magnetic domains are produced in plates of, for example, orthoferrite by means of a magnetic field. The region within which the field can vary without said domains disappearing depends upon the coercive force of the material. Field variations cause a particular irreversible variation in the domain dimensions, provided a certain minimum coercive force is present. In particular, in order to increase the stability of a hollow domain, a single-walled domain is present within it.

REFERENCES:
patent: 3140471 (1964-07-01), Fuller
patent: 3811119 (1974-05-01), Almasi et al.
Journal of Applied Physics - vol. 42, No. 4; Mar. 15, 1971, pp. 1270-1272.
IBM Technical Disclosure - vol. 13, No. 10, Mar. 1971, p. 3021.
IBM Technical Disclosure Bulletin - vol. 17, No. 11, Apr. 1975, pp. 3459-3460.

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