Inspection method for magnetic head utilizing the Kerr effect

Details Inspection method for magnetic head utilizing the Kerr effect Inspection method for magnetic head utilizing the Kerr effect

1984-12-27

1987-04-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, 250231R, 324212, G01N 2121

Patent

active

046581480

ABSTRACT:
A light beam is made to impinge upon a light reflecting section of a magnetic head provided with a magnetic layer having the light reflecting section on the surface. A change in characteristics of the light beam reflected by the light reflecting section, which is caused by the Kerr effect in accordance with a change in internal magnetization of the magnetic layer, is detected photoelectrically. Magnetic characteristics of the magnetic head are measured on the basis of the detected change in characteristics of the reflected light beam.

REFERENCES:
patent: 3594582 (1971-07-01), Abeck et al.
patent: 4560867 (1985-12-01), Papuchon et al.
patent: 4560932 (1985-12-01), Mitsui et al.

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