Magnetoresistive element assembly with longitudinal bias

Details Magnetoresistive element assembly with longitudinal bias Magnetoresistive element assembly with longitudinal bias

1996-07-23

1998-05-05

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

057484147

ABSTRACT:
A magnetoresistive (MR) element assembly with a longitudinal bias comprising a MR element, a bias coil, and spaced conductor leads is disclosed. The MR element is formed into an elongated ellipse-like shape with an elongated sense region and two end regions separated by a small nonmagnetic gap thereby reducing the longitudinal demagnetization field within the MR element. An easy axis of magnetization is formed by the MR element and oriented in a direction parallel to the main axis of the element. A bias coil is disposed about the MR element to produce a longitudinal bias field sufficient to maintain the elongated sense region in a single domain state. The elongated ellipse-like shaped MR element features a uniformly reduced demagnetization field for inhibiting the formation of a multi-domain state within the elongated sense region. The MR element assembly thus improves sensitivity of the MR head and suppresses Barkhausen noise in the output of the head.

REFERENCES:
patent: 4219854 (1980-08-01), Church et al.
patent: 4277808 (1981-07-01), Nagaki
patent: 5164869 (1992-11-01), Fontana, Jr. et al.
patent: 5184267 (1993-02-01), Mallary
Mallary et al., "A New Thin Film Head which Doubles the Flux through the Coil", IEEE Transactions on Magnetics 29, No. 3832-3836 (1993).

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