Manufacture of magnetic materials which exhibit exchange anisotr

Details Manufacture of magnetic materials which exhibit exchange anisotr Manufacture of magnetic materials which exhibit exchange anisotr

1974-12-23

1976-06-08

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148105, 252 6255, H01F 106

Patent

active

039619907

ABSTRACT:
A process for the manufacture of magnetic materials containing a phase A with a ferromagnetic spin system, of composition Co.sub.x Ni.sub.1.sub.-x and a phase B with an antiferromagnetic spin system of composition (CoO).sub.x (NiO).sub.1.sub.-x , with values of x from 0.05 to 0.96, the phases A and B showing exchange interaction. The materials are manufactured by surface oxidation of starting materials having a ferromagnetic layer, at least on the surface but optionally extending deeper, of composition A, to produce the antiferromagnetic phase B, nitrous oxide being used as the oxidant. Magnetic materials thus obtained have an asymmetrical hysteresis loop, which manifests itself at different temperatures, namely the particular Neel temperature of the phase B, which depends on the composition of the phases which varies in accordance with the values of x.

REFERENCES:
patent: 1695041 (1928-12-01), Elmen
patent: 1954102 (1934-04-01), Roseby
patent: 3460968 (1969-08-01), Bate et al.
patent: 3726664 (1973-04-01), Parker et al.

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