Compositions – Magnetic – Iron-oxygen compound containing
Patent
1983-10-25
1985-11-19
Demers, Arthur P.
Compositions
Magnetic
Iron-oxygen compound containing
75251, 148 3155, 252 6257, 252 6258, 252 6259, 252 626, 252 6261, 252 6262, 252 6263, 252 6264, 428403, 428692, 428693, 428900, C01G 4908, C04B 3526
Patent
active
045540896
ABSTRACT:
Cobalt-free ferromagnetic particles are disclosed. The particles are comprised of ferromagnetic metal inner cores and an outer oxidized layer. The particles have a saturation magnetization of 60 to 100 emu/g and a coercive force of 500 Oe or more. The outer layer provides a means for stabilizing the magnetic characteristics of the particles at temperatures not higher than 80.degree. C. in air. The particles are produced by gradually oxidizing ferromagnetic metal particles containing no cobalt in oxygen-containing gas such that the surface-oxidized metal particles have a saturation magnetization of 60 to 100 emu/g. The particles provided have good magnetic characteristics which are maintained with the passage of time even when the particles are subjected to adverse temperature and humidity conditions.
REFERENCES:
patent: 4043846 (1977-08-01), Amemiya et al.
patent: 4251592 (1981-02-01), Takedoi et al.
patent: 4262037 (1981-04-01), Asada et al.
Swartz et al., "Photon Trapping", Optics Letters, vol. 1, (2), Aug. 1977, pp. 73-75.
Kitamoto Tatsuji
Umemura Shizuo
Demers Arthur P.
Fuji Photo Film Co. , Ltd.
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