Ferromagnetic powder and method for producing the same

Details Ferromagnetic powder and method for producing the same Ferromagnetic powder and method for producing the same

1989-05-24

1990-04-24

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

20415751, 427 531, 427 541, B01J 1908, B05D 306

Patent

active

049197762

ABSTRACT:
A method for producing ferromagnetic powder comprising metal oxide magnetic powder particles and a magnetic metal layer of at least one metal selected from the group consisting of iron, cobalt and nickel which layer is formed on a surface of the powder particle and has a magnetic easy axis of magnetization in substantially the same direction as that of the powder particle, which has improved coercive force and saturation magnetization, comprising irradiating with light a liquid medium dispersion containing the metal oxide magnetic particles, a reducing agent, and at least one metal ion selected from the group consisting of iron ion, cobalt iron, and nickel iron.

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patent: 4559237 (1985-12-01), Meier

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