MAGNETIC READ SENSOR WITH BAR SHAPED AFM AND PINNED LAYER STRUCTURE AND SOFT MAGNETIC BIAS ALIGNED WITH FREE LAYER
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United States of America Patent
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Issued Date -
Aug 6, 2015
app pub date -
Jan 31, 2014
filing date -
Jan 31, 2014
priority date (Note) -
Abandoned
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Abstract
A magnetic sensor having a structure that optimizes magnetic pinning strength and magnetic free layer stability. The sensor includes a sensor stack having a magnetic free layer that extends to a first stripe height and a pinned layer that extends beyond the first stripe height to a second stripe height. Magnetic bias structures are formed at the sides of the free layer and are each formed upon a non-magnetic fill layer that raises the bias layer to the level of the free layer, the non-magnetic fill layer being at the level of the pinned layer in the sensor stack. The fill layer allows the free layer stripe height to be defined in a partial mill process while allowing the pinned layer to extend beyond the free layer stripe height and also advantageously allows the bias layers to have a stripe height that is aligned with the free layer stripe height.
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