Magnetic substance having sharp permeability transition temperat

Details Magnetic substance having sharp permeability transition temperat Magnetic substance having sharp permeability transition temperat

1988-10-28

1992-02-18

Sheehan, John P.

Compositions

Magnetic

Iron-oxygen compound containing

252 6256, 252 6257, 252 6259, 252 626, 252 6261, 148100, C04B 3526

Patent

active

050891596

ABSTRACT:
A magnetic mateial which includes an impurity metal of relatively large atomic diameter such as zinc, titanium, zirconium, yttrium, or cadmium introduced uniformly therein in amount sufficient to distort its crystaline structure to alter its anisotrophy so that the permeability of the substance remains substantially constant with changes in temperature up to the permeability transition temperature and; there being also introduced uniformly therein further metallic atoms which achieve a desired transition temperature within an accuracy of at least 0.1.degree. C. such material being utilized in an apparatus adapted to be interrogated to disclose whether its temperature is above or below the transition temperature within at least 0.1.degree. C., the signal propagating properties of the material altering drastically at such temperature, the material having an output which is inherently digital and directly compatible with digital information processing and control without A/D conversion.

REFERENCES:
patent: 2579978 (1951-12-01), Snoek et al.
patent: 3002930 (1961-10-01), Robinson et al.
patent: 3509058 (1970-04-01), Estival et al.
patent: 3532630 (1970-10-01), Tenzer
patent: 3573208 (1971-03-01), Brockman et al.
patent: 3574116 (1971-04-01), Sugano et al.

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