Magnetic disk apparatus
First Claim
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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Accused Products
Abstract
According to one embodiment, a magnetic disk apparatus includes a main magnetic pole configured to apply a recording magnetic field to a recording medium, a recording coil configured to magnetize the main magnetic pole, a spin-torque oscillator adjacent to the main magnetic pole, and configured to generate a high frequency magnetic field, 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 overshoot current of the recording current in proportion to the magnitude of the driving current after the recording current has reversed.
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Citations
13 Claims
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1. A magnetic disk apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification