High density dual gap magnetic head using polar Kerr effect

Details High density dual gap magnetic head using polar Kerr effect High density dual gap magnetic head using polar Kerr effect

1993-07-23

1994-03-22

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

369 13, G11B 5127, G11B 1304

Patent

active

052969894

ABSTRACT:
A magnetic head comprising a magnetic path and a vertically magnetizable film. The magnetic path contains a first gap facing a magnetic recording medium and a second gap. The vertically magnetizable film is formed across the second gap on the principal plane or outer circumference of the magnetic path. A linearly polarized light beam is irradiated onto the vertically magnetizable film and the resulting reversal of magnetization in the vertically magnetizable film is detected through the use of a polar Kerr effect. This scheme allows data to be reproduced with sufficient sensitivity from tracks of very small widths.

REFERENCES:
patent: 4707755 (1987-11-01), Ohta et al.
patent: 5051970 (1991-09-01), Ishii et al.
patent: 5070487 (1991-12-01), Watson
patent: 5216643 (1993-06-01), Berg
patent: 5218488 (1993-06-01), Berg

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