Magnetic head having two legs of predetermined saturation magnet

Details Magnetic head having two legs of predetermined saturation magnet Magnetic head having two legs of predetermined saturation magnet

1987-06-11

1988-11-01

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Core

360126, 360123, G11B 5127, G11B 5147

Patent

active

047824166

ABSTRACT:
A magnetic head comprising a stratified buildup on a non-magnetic substrate for a recording medium to be magnetized vertically comprises a ring head-like conducting body for carrying magnetic flux having two magnet legs which comprise several magnetic layers with predetermined saturation magnetization and delineate a space in between, through which the turns of an at least largely flat write/read coil winding extend. With this head it is possible to generate a sufficiently large read voltage, wherein the same advantages are present as if single-pole heads are used. The first magnet leg comprises, in the region of its pole, at least a first magnetic layer having a predetermined low saturation magnetization and the second magnet leg comprises, at least in the region of its pole, a magnetic layer, the saturation magnetization of which is larger than the saturation magnetization of the first magnetic layer of the first magnet leg, so that for the write function the pole area of the first magnetic layer is saturated magnetically due to a write current flowing in the coil winding. Preferably, the first magnet leg has, outside its pole area, at least one further magnetic layer comprising a material with a higher saturation magnetization.

REFERENCES:
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patent: 4287544 (1981-09-01), Lazzari
patent: 4295173 (1981-10-01), Romankiw et al.
patent: 4589042 (1986-05-01), Anderson et al.
patent: 4631612 (1986-12-01), Shiiki et al.
patent: 4631613 (1986-12-01), French
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vol. Mag 17, No. 6, Nov. 1981., pp. 3120-3122 Lazzari et al.
vol. Mag 18, No. 6, Nov. 1982, pp. 1158-1163 Fujiwara et al.
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vol. Mag 19, No. 5, Sep. 1983, pp. 2239-2244 Bromley
vol. Mag 16, No. 5, Sep. 1980, pp. 967-972 Potter et al.
vol. Mag 17, No. 6, Nov. 1981, pp. 2538-2540 Yamamori et al.
J. Appl. Phys, vol. 53, No. 3, 1982, pp. 2593-2595 Oshiki et al.

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