MR head with complementary easy axis permanent magnet

Details MR head with complementary easy axis permanent magnet MR head with complementary easy axis permanent magnet

1988-07-28

1990-02-20

Hecker, Stuart N.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 5127, G11B 533

Patent

active

049031589

ABSTRACT:
The invention teaches the use of a permanent magnet easy axis biasing structure having the same (or nearly so) physical geometry as the MR sense film itself, whereby a similar, but opposite, demagnetization field is generated in the biasing structure as is generated in the sense film. Thus, with the two demagnetization fields complementarily cancelling each other, any tendency of the sense film for multi-domain formation therein is cancelled (or at least lessened).

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Bajosek et al., "Cobalt--Chromium Films for Hard Magnetic Biasing of Magnetoresistors and for Magnetic Recording Medium," IBM TDB, Mar. 1979, vol. 21, No. 10, pp. 4239-4240.

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