Spin valve magnetoresistive head and manufacturing method theref

Details Spin valve magnetoresistive head and manufacturing method theref Spin valve magnetoresistive head and manufacturing method theref

1998-01-14

2000-09-26

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, C21D 104

Patent

active

061237809

ABSTRACT:
A method for manufacturing a spin valve GMR head is describe in which a fixed magnetic layer of the head may maintain magnetization in a desired orientation. In one aspect of the invention, the method comprises steps of: forming a magnetic film including at least a free magnetic layer, a non-magnetic metallic layer, a fixed magnetic layer, and a magnetic domain control layer; subjecting the magnetic film to a first heat treatment under a magnetic field to enhance magnetic anisotropy of the free magnetic layer; and subjecting the magnetic film to a second heat treatment under a magnetic field and at a higher temperature than the maximum temperature applied in the processes that precede the second heat treatment, to fix the magnetization in the fixed magnetic layer. In anther aspect of the invention, the method comprises steps of: forming a magnetic film including a free magnetic layer, a non-magnetic metallic layer, a fixed magnetic layer, and a magnetic domain control layer; subjecting the magnetic film to a first heat treatment under a magnetic field to fix the magnetization in the fixed magnetic layer; subjecting the magnetic film to a second heat treatment under a magnetic field to enhance magnetic anisotropy of the free magnetic layer; and subjecting the magnetic film to a third heat treatment in the absence of an externally applied magnetic field.

REFERENCES:
patent: 5772794 (1998-06-01), Uno et al.

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