Magnetoresistive head and magnetic recording drive
AssigneeFujitsu Limited
InventorHitoshi Kanai
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Abstract
This invention concerns a magnetoresistive head for converting a change in magnetic field into a change in resistance by virtue of a spin valve magnetoresistive effect. This magneto-resistive transducer has superposed sequentially on a substrate an underlayer formed of two layers consisting of a tantalum film and a nickel iron based alloy film, an antiferromagnetic layer, a first soft magnetic layer, a nonmagnetic metal layer, and a second soft magnetic layer in the order mentioned.
Claims7
A magnetoresistive head characterized by having superposed sequentially on a substrate:
- an underlayer formed of two layers consisting of a tantalum film and a nickel iron based alloy film;
- an antiferromagnetic layer wherein said antiferromagnetic layer is a nickel manganese based alloy layer having a face centered tetragonal lattice structure;
- a first soft magnetic layer, and
- a second soft magnetic layer in the order mentioned.
A method for producing a magnetoresistive head, comprising the steps of:
- superposing an underlayer formed of two layers consisting of a tantalum film and a nickel iron based alloy film on a substrate;
- superposing a nickel manganese based alloy antiferromagnetic layer on said nickel iron based alloy film of said underlayer;
- superposing a first soft magnetic layer on said antiferromagnetic layer,
- superposing a nonmagnetic layer on said first soft magnetic layer;
- superposing a second soft magnetic layer on said nonmagnetic layer;
- and
- heat treating said superposed layers to impart a face centered tetragonal lattice structure in said antiferromagnetic layer.
A magnetoresistive head produced by the method comprising the steps of:
- superposing an underlayer formed of two layers consisting of a tantalum film and a nickel iron based alloy film on a substrate;
- superposing a nickel manganese based alloy antiferromagnetic layer on said nickel iron based alloy film of said underlayer;
- superposing a first soft magnetic layer on said antiferromagnetic layer,
- superposing a nonmagnetic layer on said first soft magnetic layer;
- superposing a second soft magnetic layer on said nonmagnetic layer;
- and
- heat treating said superposed layers to impart a face centered tetragonal lattice structure in said antiferromagnetic layer.
Dependencies are inferred from the claim text.