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US 5,862,021 AGranted
Magnetoresistive effect device utilizing an oxide layer adjacent one of the magnetic layers
AssigneeSharp Kabushiki Kaisha
InventorsHaruhiko Deguchi, Takaya Nakabayashi, Tomohisa Komoda, Tohru Kira, Noboru Fujita, Kazuhiro Uneyama
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Abstract
A magnetoresistive effect device is formed by layering a nonmagnetic Co oxide film, a pinned magnetization layer made of Co, a nonmagnetic layer made of Cu, a free magnetization layer made of NiFe in this order on a substrate made of glass or Si. By arranging the nonmagnetic Co oxide film in contact with the pinned magnetization layer, it is possible to produce a magnetoresistive effect device with a high saturation field and a high sensitivity.
Claims27
A magnetoresistive effect device comprising:
- a magnetoresistive effect film including a first magnetic layer whose magnetization direction rotates according to an external magnetic field, a nonmagnetic layer formed next to said first magnetic layer, and a second magnetic layer whose magnetization direction is fixed in one direction, said second magnetic layer being placed next to said nonmagnetic layer, said magnetoresistive effect film having a magnetoresistive effect produced by an angle between the magnetization directions of said first and second magnetic layers;
- and
- a nonmagnetic oxide layer adjacent to said second magnetic layer of said magnetoresistive effect film.
A magnetoresistive effect device comprising:
- a magnetoresistive effect film including a first magnetic layer whose magnetization direction rotates according to an external magnetic field, a nonmagnetic layer adjacent to said first magnetic layer, and a second magnetic layer whose magnetization direction is fixed in one direction, said second magnetic layer being placed next to said nonmagnetic layer, said magnetoresistive effect film having a magnetoresistive effect produced by an angle between the magnetization directions of said first and second magnetic layers;
- and
- a Co oxide layer as a buffer layer of said first magnetic layer of said magnetoresistive effect film.
Dependencies are inferred from the claim text.