Magnetoresistive sensor and head
First Claim
1. A method of manufacturing a magnetoresistive effect device, said method comprising:
- forming a first antiferromagnetic layer made of a PtMn alloy on a substrate by a DC magnetron sputtering process,forming a first pinned magnetic layer on said first antiferromagnetic layer in direct contact by a DC magnetron sputtering process,forming a first non-magnetic electrically conductive layer on said first pinned magnetic layer,forming a free magnetic layer on said first non-magnetic electrically conductive layer,forming a second non-magnetic electrically conductive layer on said free magnetic layer,forming a second pinned magnetic layer on said second non-magnetic electrically conductive layer by a DC magnetron sputtering process,forming a second antiferromagnetic layer made of a PtMn alloy on said second pinned magnetic layer in direct contact by a DC magnetron sputtering process, andheat-treating said first antiferromagnetic layer, said first pinned magnetic layer, said second pinned magnetic layer, and said second antiferromagnetic layer in a magnetic field at a temperature of between 210°
C. and 250°
C.
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Abstract
PtMn films are used as antiferromagnetic layers of a dual spin-valve type magnetoresistive sensor. An exchange anisotropic magnetic field is achieved regardless of whether the PtMn film is formed over or under the pinned magnetic layer. Also, an effective exchange anisotropic magnetic field is produced even with heat treatment at a relatively low temperature. Alternatively, a PtMn film is used as an antiferromagnetic layer of a spin-valve film laminate. The use of a PtMn film enables a sufficient exchange anisotropic magnetic field to be produced even with a relatively low heat treatment temperature and a relatively small film thickness. Therefore, the number of total layers of the spin-valve film laminate can be increased to increase a magnetoresistance ratio, and a total thickness of the spin-valve film laminate can be made relatively small.
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Citations
15 Claims
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1. A method of manufacturing a magnetoresistive effect device, said method comprising:
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forming a first antiferromagnetic layer made of a PtMn alloy on a substrate by a DC magnetron sputtering process, forming a first pinned magnetic layer on said first antiferromagnetic layer in direct contact by a DC magnetron sputtering process, forming a first non-magnetic electrically conductive layer on said first pinned magnetic layer, forming a free magnetic layer on said first non-magnetic electrically conductive layer, forming a second non-magnetic electrically conductive layer on said free magnetic layer, forming a second pinned magnetic layer on said second non-magnetic electrically conductive layer by a DC magnetron sputtering process, forming a second antiferromagnetic layer made of a PtMn alloy on said second pinned magnetic layer in direct contact by a DC magnetron sputtering process, and heat-treating said first antiferromagnetic layer, said first pinned magnetic layer, said second pinned magnetic layer, and said second antiferromagnetic layer in a magnetic field at a temperature of between 210°
C. and 250°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a magnetoresistive effect device, said method comprising:
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forming a first free magnetic layer on a substrate, forming a first non-magnetic electrically conductive layer on said first free magnetic layer, forming a first pinned magnetic layer on said first non-magnetic electrically conductive layer by a DC magnetron sputtering process, forming an antiferromagnetic layer made of a PtMn alloy on said first pinned magnetic layer in direct contact by a DC magnetron sputtering process, forming a second pinned magnetic layer on said antiferromagnetic layer in direct contact relation by a DC magnetron sputtering process, forming a second non-magnetic electrically conductive layer on said second pinned magnetic layer, forming a second free magnetic layer on said second non-magnetic electrically conductive layer, and heat-treating said first pinned magnetic layer, said antiferromagnetic layer, and said second pinned magnetic layer in a magnetic field at a temperature of between 210°
C. and 250°
C. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification