Laser power sensor for thermally assisted magnetic recording
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United States of America Patent
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Mar 26, 2013
Grant Date -
Sep 10, 2009
app pub date -
Mar 4, 2008
filing date -
Mar 4, 2008
priority date (Note) -
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Abstract
An apparatus, system, and method for measuring thermally induced electric resistance changes in thermally assisted magnetic recording are disclosed for monitoring laser light output in thermally assisted magnetic recording disk drives. An electrical lead is coupled to a read/write head element. A first electrical resistance in the read/write head element is measured. The read/write head is heated by a laser and a second electrical resistance in the read/write head element is measured. The electrical resistance may be monitored at regular intervals when the read/write head element is on the ramp or the electrical resistance measurements may be continuously monitored as the read/write head flies over the magnetic media.
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