Spin valve magnetic head with three underlayers
First Claim
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1. A spin valve magnetic head, providing on a substrate, a laminated structure that has an antiferromagnetic layer, fixation layer, non-magnetic layer and unconstraint layer, comprising:
- a first underlayer of Ta;
a second underlayer of NiFeCr; and
a third underlayer of NiFe, said first, second and third underlayers being interposed between said substrate and said laminated structure.
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Abstract
A spin valve magnetic head, providing on a substrate, a laminated structure that has an antiferromagnetic layer, fixation layer, non-magnetic layer and unconstraint layer, and having a first underlayer of Ta, a second underlayer of NiFeCr and a third underlayer of NiFe, which underlayers are interposed between the substrate and the laminated structure.
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Citations
34 Claims
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1. A spin valve magnetic head, providing on a substrate, a laminated structure that has an antiferromagnetic layer, fixation layer, non-magnetic layer and unconstraint layer, comprising:
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a first underlayer of Ta;
a second underlayer of NiFeCr; and
a third underlayer of NiFe, said first, second and third underlayers being interposed between said substrate and said laminated structure. - View Dependent Claims (3, 5, 7, 8, 11, 25, 27, 29, 31, 33)
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2. A dual spin valve magnetic head, providing on a substrate, a laminated structure that has a first antiferromagnetic layer, first fixation layer, first non-magnetic layer, unconstraint layer, second non-magnetic layer, second fixation layer and second antiferromagnetic layer, comprising:
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a first underlayer of Ta;
a second underlayer of NiFeCr; and
a third underlayer of NiFe, said first, second and third underlayers being interposed between said substrate and said laminated structure. - View Dependent Claims (4, 6, 9, 10, 12, 28, 30, 32, 34)
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13. A spin valve magnetic head, providing on a substrate, a laminated structure that has an antiferromagnetic layer, fixation layer, non-magnetic layer and unconstraint layer, comprising:
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a first underlayer of Ta;
a second underlayer of NiCr; and
a third underlayer of NiFe, said first, second and third underlayers being interposed between said substrate and said laminated structure. - View Dependent Claims (15, 17, 19, 20, 23)
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14. A dual spin valve magnetic head, providing on a substrate a laminated structure that has a first antiferromagnetic layer, first fixation layer, first non-magnetic layer, unconstraint layer, second non-magnetic layer, second fixation layer and second antiferromagnetic layer, comprising:
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a first underlayer of Ta;
a second underlayer of NiCr; and
a third underlayer of NiFe, said first, second and third underlayers being interposed between said substrate and said laminated structure. - View Dependent Claims (16, 18, 21, 22, 24, 26)
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Specification