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US 6,888,707 B2Granted
Spin filter bottom spin valve head with continuous spacer exchange bias
AssigneeHeadway Technologies, Inc.
InventorsCheng T. Horng, Mao-Min Chen, Min Li, Ru-Ying Tong
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Abstract
A high performance specular free layer bottom spin valve is disclosed. This structure made up the following layers: NiCr/MnPt/CoFe/Ru/CoFe/Cu/free layer/Cu/Ta or TaO/Al2O3. A key feature is that the free layer is made of a very thin CoFe/NiFe composite layer. Experimental data confirming the effectiveness of this structure is provided, together with a method for manufacturing it and, additionally, its longitudinal bias leads.
Claims2
A read head, comprising:
- a bottom spin valve that includes a specular free layer, said free layer further comprising a cobalt-iron layer that is between 5 and 8 Angstroms thick and a nickel-iron layer that is between 19 and 21 Angstroms thick;
- on the free layer, a high conductance copper layer everywhere except in a lead area;
- on the high conductance copper layer, a specular reflection layer;
- on the nickel-iron layer in the lead area, an exchange biasing layer selected from the group consisting of MnPt, InMn, MnNi, and MnPtPd;
- and
- on said exchange biasing layer, a layer of conductive material.
3 more elements
Dependencies are inferred from the claim text.