Spin valve head reducing barkhausen noise

Details Spin valve head reducing barkhausen noise Spin valve head reducing barkhausen noise

1998-07-07

2000-07-25

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

060943254

ABSTRACT:
A spin valve head comprises a spin valve film having at least a pinned magnetic layer, a nonmagnetic metal layer, and a free magnetic layaer. The spin valve head further comprises a hard magnetic layer for controlling magnetic domains of the free magnetic layer, and electrode elements for supplying a sense current to the spin valve film, wherein the hard magnetic layer and the free magnetic layer are positioned not to overlap an orthographic projection of the hard magnetic layer in a thickness direction of the spin valve film with an orthographic projection of the free magnetic layer in the thickness direction of the spin valve film. According to such configuration, a single magnetic domain structure which does not generate a reverse magnetic field region throughout the overall surface of the free magnetic layer can be obtained, so that the hysteresis phenomenon is not caused in the spin valve head output. Therefore, the output with no noise can be derived.

REFERENCES:
patent: 5528440 (1996-06-01), Fontana et al.
patent: 5883764 (1999-03-01), Pinarbasi
patent: 5936810 (1999-08-01), Nakamoto

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