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Magnetic disk apparatus

  • US 8,953,273 B1
  • Filed: 09/10/2014
  • Issued: 02/10/2015
  • Est. Priority Date: 06/30/2014
  • Status: Active Grant
First Claim
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1. A magnetic disk apparatus comprising:

  • a main magnetic pole configured to apply a recording magnetic field to a recording layer of a recording medium;

    a recording coil configured to magnetize the main magnetic pole;

    a spin-torque oscillator, configured to generate a high frequency magnetic field, adjacent to the main magnetic pole and close to a medium-facing surface opposite the recording medium;

    a recording current control circuit configured to supply a recording current to the recording coil;

    a driving current control circuit configured to supply a fixed driving current to the spin-torque oscillator; and

    an overshoot control circuit configured to control, in proportion to a magnitude of the driving current, overshoot current of the recording current occurring after the recording current has reversed.

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