Compensated magneto-resistive read head

Details Compensated magneto-resistive read head Compensated magneto-resistive read head

1988-01-19

1989-11-14

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

360125, G11B 512

Patent

active

048811432

ABSTRACT:
A read/write head for a hard disk provides both a magneto-resistive read function and an inductive write function in a common gap. The inductive write function is provided by a current carrying coil which is magnetically coupled to top and bottom shields or pole tips which in turn induce the magnetic fields required for writing on the disk. Mutually biasing magneto-resistive read sensor are located between the shields, which serve to improve the resolution of the read function. During a read operation, read/write circuitry maintains a current in the coil which cancels, at least partially, magnetic fields induced by sensing and bias currents in the magneto-resistive heads which might other perturb information stored in the medium. This arrangement provides a read/write head with improved read/write resolution as required by emerging high density storage media in compact formats.

REFERENCES:
patent: 3887945 (1975-06-01), Nepela et al.
patent: 3945038 (1976-03-01), Lazzari
patent: 4547824 (1985-10-01), Best et al.
patent: 4639811 (1987-01-01), Diepers et al.
patent: 4698711 (1987-10-01), Vinal

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