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半导体学报 2010
A micron-sized GMR sensor with a CoCrPt hard bias
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Abstract:
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,...
