Magnetoresistive head with micro-crystallite shielding layer

Details Magnetoresistive head with micro-crystallite shielding layer Magnetoresistive head with micro-crystallite shielding layer

1995-06-05

1997-11-11

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

056870442

ABSTRACT:
An MR head includes a soft magnetic (SAL) layer, a nonmagnetic (SHUNT) layer, and a magnetoresistive (MR) layer, which are formed on top of each other, with shielding layers being formed on the upper and lower sides of these layers. The shielding layers, which are formed, for example, of an Fe-based fine crystalline material, are heated in a magnetic field, so that the magnetic permeability in the direction of the normal of the recording medium (the y-direction) of the shielding layers is higher than the magnetic permeability in the track-width direction (the x-direction) of the same, whereby it is possible to enhance the shielding effect of the shielding layers with respect to a leakage magnetic field from the recording medium. Further, due to the relatively low magnetic permeability in the x-direction of the shielding layers, a bias magnetic field imparted to the magnetoresistive layer from the hard bias layer is not easily drawn in the shielding layers.

REFERENCES:
patent: 3908194 (1975-09-01), Romankiw
patent: 3975772 (1976-08-01), Lin
patent: 4321640 (1982-03-01), van Gestel
patent: 4547824 (1985-10-01), Best et al.
patent: 4843506 (1989-06-01), Gill et al.
patent: 5244627 (1993-09-01), Katsuki
patent: 5515221 (1996-05-01), Gill et al.

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