Method of forming modified portion and magnetic recording member

Details Method of forming modified portion and magnetic recording member Method of forming modified portion and magnetic recording member

1991-10-04

1993-01-19

Padgett, Marianne

Coating processes

Direct application of electrical, magnetic, wave, or...

Electromagnetic or particulate radiation utilized

427130, 427131, 156632, 156645, B05D 306, B05D 512, B44C 122, H01L 21306

Patent

active

051806096

ABSTRACT:
A member is prepared by forming a magnetic surface layer on a magnetic base member having a different composition from the surface layer. A laser beam is radiated onto the member so as to fuse the member and the surface layer, thereby forming a fused portion having magnetic properties. A modified portion is formed in a portion of the fused portion corresponding to the surface layer such that this portion has different permeability from other portions of the surface layer.

REFERENCES:
patent: 3900593 (1975-08-01), Herczog et al.
patent: 3959553 (1976-05-01), Hartmann et al.
patent: 4254189 (1981-03-01), Fisher
patent: 4650708 (1987-03-01), Takahashi
patent: 4664941 (1987-05-01), Washburn
patent: 4871582 (1989-10-01), Miyabayashi
patent: 4964967 (1990-10-01), Hashimoto et al.

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