Magnetoresistive head having improved hard biasing characteristics through the use of a multi-layered seed layer including an oxidized tantalum layer and a chromium layer
US6636400B2 · kind B2 · utility
20Cited by
20References
20Claims
0Family size
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Key dates
| Filing date | Sep 18, 2001 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Mar 19, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/3996
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic head with improved hard magnet properties includes a read sensor; a multi-layered seed layer formed adjacent to the read sensor and over a contiguous junction region of the read sensor; and a hard bias layer formed over the multi-layered seed layer. The multi-layered seed layer includes a first seed layer of oxidized tantalum and a second seed layer of chromium. The contiguous junction region exposes one or more sensor materials such as tantalum, nickel-iron, cobalt-iron, copper, platinum-manganese and ruthenium. The hard bias layer is preferably cobalt-platinum-chromium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.