Magnetic recording and reproducing apparatus having a magnetic read head with a spin-torque oscillator
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United States of America Patent
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May 10, 2011
Grant Date -
Mar 4, 2010
app pub date -
Aug 27, 2009
filing date -
Aug 29, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A magnetic recording and reproducing apparatus includes a magnetic head that has a spin-torque oscillator and a magnetic disk and the spin-torque oscillator detects a magnetic field from the magnetic disk and outputs a signal. A criterion used to determine the rotational speed of the magnetic disk, the frequency shift of the spin-torque oscillator produced by a magnetic field from the magnetic disk, a characteristic oscillation frequency of the spin-torque oscillator and the full-width at half maximum of an oscillation spectrum is given in order for a read signal output from the spin-torque oscillator to satisfy a desired signal-to-noise ratio and a magnetic recording and reproducing apparatus is configured based on the criterion.
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