MAGNETIC RECORDING HEAD HAVING THERMAL FLY HEIGHT CONTROL ELEMENT WITH NEAR ZERO MAGNETOMOTIVE FORCE
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United States of America Patent
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Issued Date -
Jul 30, 2015
app pub date -
Jan 28, 2014
filing date -
Jan 28, 2014
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Abandoned
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Abstract
A magnetic recording head with thermal fly height control, wherein the heating element is configured to eliminate magnetic field effects on the writing pole, which would cause otherwise cause non-symmetric writing or pole erasure. Non-symmetric writing is a phenomenon wherein magnetic writing favors one direction over another, thereby causing a timing shift in recorded data. The pole erasure is a phenomenon wherein the erasure would occur even without write current. The heating element can be formed as a plurality of electrically conductive layers separated by a non-magnetic, electrically insulating layer such as alumina. The electrically conductive layers are configured so that current flows in opposite directions through each of the electrically conductive layers such that any magnetic field generated by the current flow through one electrically conductive layer is cancelled out by a magnetic field from another electrically conductive layer.
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