Bubble device containing a ferrite biasing magnet

Details Bubble device containing a ferrite biasing magnet Bubble device containing a ferrite biasing magnet

1975-12-15

1980-06-10

Cooper, Jack

Static information storage and retrieval

Magnetic bubbles

Bias

252 6256, 252 6257, 252 6258, 252 6259, 252 6263, 365 33, 428539, 428900, G11C 1102

Patent

active

042076137

ABSTRACT:
A ferrite material has been found that is useful for a biasing magnet whose magnetic field stabilizes single wall magnetic domains. The strong temperature dependence of the ferrite's magnetic field makes the ferrite especially useful when used with magnetic materials which require a highly temperature dependent magnetic field to maintain a constant domain or bubble size. The ferrite composition is represented by the formula NiFe.sub.(1+x) Cr.sub.(1-x) O.sub.4, x is in the range between 0.04 and 0.18, and 1 percent to 10 percent, by weight, additional material selected from the group consisting of zirconium oxide, thorium oxide and hafnium oxide.

REFERENCES:
patent: 3197412 (1965-07-01), Gyorgy et al.
patent: 3711841 (1973-01-01), Geusic et al.
patent: 3886533 (1975-05-01), Bonner et al.
Anastasyuk et al. I "Chem. Abstract", vol. 79, 1973, 84947f.
LeCraw et al. "Applied Physics Letters", 26, p. 402 (1975).
Anastasyuk et al. II "Chem. Abstracts," vol. 81, 1974, 142832u.
Bogdanovich et al. "Chem. Abstracts" vol. 79, 1973, 58530v.

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