High sensitivity, low distortion yoke-type magnetoresistive head

Details High sensitivity, low distortion yoke-type magnetoresistive head High sensitivity, low distortion yoke-type magnetoresistive head

1995-06-15

2000-10-17

Crane, Sara

Dynamic magnetic information storage or retrieval

Head

Hall effect

360119, G11B 5127

Patent

active

061340782

ABSTRACT:
In order to obtain a magnetoresistive head which is high in reproducing sensitivity, free from distortion in reproduced waveforms and suitable for high bit density recording, the an MR head includes a magnetic circuit including upper yoke 2 and lower yoke 3 both made of a soft magnetic material and having one ends opposed to each other with gap 1 left therebetween, MR element A 5 magnetically coupled to the other end of upper yoke 2, MR element B 6 magnetically coupled to the other end of lower yoke 3, and back yoke 4 made of a magnetic material for magnetically coupling MR element A 5 and MR element B 6 to each other. Upper yoke 2 and lower yoke 3 are disposed without overlapping each other except at gap 1, and MR element A 5 and MR element B 6 are formed by simultaneous deposition. Due to this construction, the MR head can achieve high bit density recording where the MR elements have a differential structure, since the magnitude of the gap is defined by the film thickness of gap 1 and the MR elements obtained have equivalent characteristics.

REFERENCES:
patent: 4954920 (1990-09-01), Yamada et al.
patent: 5375023 (1994-12-01), Ju et al.
T. Maruyama et al, "A Yoke Magnetoresistive Head for High Track Density Recording", IEEE Transaction of Magnetics, vol. MAG-23, No. 5, Sep. 1987, pp. 2503-2505.

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