Magnetoresistive head having longitudinal biasing by providing undirectional magnetic anisotropy
US6778363B2 · kind B2 · utility
10Cited by
7References
17Claims
0Family size
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Key dates
| Filing date | Feb 15, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Feb 15, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49155
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided a magnetoresistive head which can realize high sensitivity and low noise even when the reading track is being reduced. Longitudinal biasing is performed to a ferromagnetic free layer whose magnetization is rotated according to an external magnetic field by providing unidirectional magnetic anisotropy by exchange coupling to an antiferromagnetic layer. A hard magnetic film is arranged at the edge of a magnetoresistive film to reduce an effective reading track width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.