Magnetoresistive effect composite head having a pole containing

Details Magnetoresistive effect composite head having a pole containing Magnetoresistive effect composite head having a pole containing

1997-11-26

2000-09-26

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

061250090

ABSTRACT:
In a magnetoresistive effect composite head, magnetic shields oppose each other on a slider main body made of a ceramic material through a predetermined gap, and a magnetoresistive effect element is sandwiched and stacked between the magnetic shields with a magnetic spacer layer made of an insulator. A recording head portion uses one of the magnetic shields as a first magnetic pole, and has a second magnetic pole formed on a surface of the first magnetic pole opposite to the magnetoresistive effect element through a magnetic gap, to record information on a recording medium by means of a magnetic field generated in the magnetic gap. The magnetoresistive effect element includes a central region made of a spin-valve element to sense a medium field, and end regions for supplying a bias field and a current to the central region. The second magnetic pole is constituted by a stacked film of first and second magnetic films having different saturation magnetizations. The first and second magnetic films are close to and far from the magnetic gap, respectively. The saturation magnetization of the first magnetic film is set to a value larger than that of the second magnetic film. A method of manufacturing the above head is also disclosed.

REFERENCES:
patent: 5606478 (1997-02-01), Chen
Robert P. Hunt, "A Magnetoresistive Readout Transducer", IEEE Transactions on Magnetics, vol. Mag. 7, No. 1, Mar. 1971, pp. 150-154.
Ching Tsang et al., "Design, Fabrication & Testing of Spin-Valve Read Heads for High Density Recording", IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994, pp. 3801-3806.

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