Magnetic recording head and magnetic recording/reproducing apparatus
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United States of America Patent
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Sep 17, 2013
Grant Date -
Feb 28, 2013
app pub date -
Feb 23, 2012
filing date -
Aug 29, 2011
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Abstract
In high frequency magnetic assisted recording technique, a spin torque oscillator that stably oscillates at a low current and a magnetic recording head with high recording density are provided. In a magnetic recording head including an oscillator that generates a high frequency magnetic field, a spin injection layer structure of two laminated magnetic layers which are coupled to be anti-parallel is adopted. A product Ms×t of the saturated magnetization Ms and the film thickness t of the first magnetic layer close to a field generation layer is smaller than a product Ms×t of the second magnetic layer remote from the field generation layer.
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