HAMR writer pole length characterization
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United States of America Patent
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Nov 10, 2015
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N/A
app pub date -
Nov 11, 2014
filing date -
Nov 11, 2014
priority date (Note) -
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Abstract
The present disclosure generally relates to a HAMR head and techniques and apparatus for HAMR writer pole length characterization. One or more bits may be magnetically written on a disk using a leading edge of the writer pole at a first polarity. The disk may be moved under a body of the writer pole to magnetically write the one or more bits in the disk at a second polarity that is opposite to the first polarity to generate a feedback pulse having a signal amplitude. The signal amplitude of the feedback pulse may be measured as a function of writing frequency. A first effective length of the writer pole may be determined based on the measurements.
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