Magneto-resistance effect magnetic head

Details Magneto-resistance effect magnetic head Magneto-resistance effect magnetic head

1997-03-31

1998-07-28

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

057869650

ABSTRACT:
A magneto-resistance effect magnetic head in which the MR effects of the two MR thin films of a MR device are balanced for suppressing Barkhausen noise and assuring a stabilized output. Between a lower-layer magnetic shield core and an upper layer magnetic shield core is arranged an MR device, made up of two MR thin films such that a distance d.sub.1 between the lower-layer magnetic shield core and the MR thin film is smaller than a distance d.sub.2 between the upper-layer magnetic shield core and the MR thin film. A film thickness t.sub.1 of the MR thin film towards the lower-layer magnetic shield core is set so as to be thinner than a film thickness t.sub.2 of the MR thin film towards the upper-layer magnetic shield core. Preferably, the relation 0.5<t.sub.1 /t.sub.2 holds. Also, a resistivity .rho..sub.1 of the MR thin film closer to the lower layer magnetic shield core may be larger than a resistivity .rho..sub.2 of the MR thin film. Preferably, the relation .rho..sub.1 /.rho..sub.2 >3 holds.

REFERENCES:
patent: 4639808 (1987-01-01), Thornley
patent: 5073836 (1991-12-01), Gill et al.
patent: 5323285 (1994-06-01), Smith
patent: 5661620 (1997-08-01), Saito et al.

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