A micron-sized GMR sensor with a CoCrPt hard bias

A GMR（giant magneto-resistive） spin valve sensor for magnetic recording has been designed in an attempt to solve the Barkhausen noise problem in small-sized GMR sensors.In this study,the GMR ratio of the top-pinned spin valve is optimized to a value of 13.2%.The free layer is magnetized perpendicula...

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Bibliographic Details
Published in:Journal of semiconductors 2010 (2), p.19-22
Main Author: 郑洋 曲炳郡 刘晰 韦丹 魏福林 任天令 刘理天
Format: Article
Language:Chinese
Subjects:
偏见
噪音问题
巨磁电阻传感器
微米
永磁偏置
磁传感器
磁电阻率
织构
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Summary:A GMR（giant magneto-resistive） spin valve sensor for magnetic recording has been designed in an attempt to solve the Barkhausen noise problem in small-sized GMR sensors.In this study,the GMR ratio of the top-pinned spin valve is optimized to a value of 13.2%.The free layer is magnetized perpendicular to the pinned layer by a CoCrPt permanent magnetic bias so that a linear magnetic field response can be obtained.An obvious improvement on performance is observed when the permanent magnetic bias is magnetized,while the GMR sensor has a steadier MR-H loop and a smaller coercive field.
ISSN:1674-4926