SCISSOR MAGNETIC SENSOR HAVING A BACK EDGE SOFT MAGNETIC BIAS STRUCTURE
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United States of America Patent
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Issued Date -
Jan 1, 2015
app pub date -
Jun 26, 2013
filing date -
Jun 26, 2013
priority date (Note) -
Abandoned
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Abstract
A scissor type magnetic sensor having a soft magnetic bias structure located at a back edge of the sensor stack. The sensor stack includes first and second magnetic free layers that are anti-parallel coupled across a non-magnetic layer sandwiched there-between. The soft magnetic bias structure has a length as measured perpendicular to the air bearing surface that is greater than its width as measured parallel with the air bearing surface. This shape allows the soft magnetic bias structure to have a magnetization that is maintained in a direction perpendicular to the air bearing surface and which allows the bias structure to maintain a magnetic bias field for biasing the free layers of the sensor stack.
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