Method of manufacturing a lead overlay bottom spin valve with improved side reading
The invention relates to the general field of read heads for magnetic disk systems with particular reference to the problem of controlling width of area read. In bottom spin valves of the lead overlay type the longitudinal bias field that stabilizes the device tends to fall off well before the gap i...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
24.08.2004
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| Online Access | Get full text |
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| Summary: | The invention relates to the general field of read heads for magnetic disk systems with particular reference to the problem of controlling width of area read.
In bottom spin valves of the lead overlay type the longitudinal bias field that stabilizes the device tends to fall off well before the gap is reached. This problem has been overcome by providing a manufacturing process that includes inserting an additional antiferromagnetic layer between the hard bias plugs and the overlaid leads. This additional antiferromagnetic layer and the lead layer are etched in the same operation to define the read gap, eliminating the possibility of misalignment between them. The extra antiferromagnetic layer is also longitudinally biased so there is no falloff in bias strength before the edge of the gap is reached. A process for manufacturing the device is also described. |
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