Magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorGaku Koizumi
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a magnetic disk, a recording head and a controller configured to control the recording head. The recording head includes a high-frequency oscillator disposed in a write gap formed between a main magnetic pole and a return magnetic pole, and a bias voltage application circuit configured to apply a bias voltage to the high-frequency oscillator. The controller includes a bias voltage controller configured to change a bias voltage to be applied to the high-frequency oscillator in accordance with a sampling frequency of data before the data is recorded on the magnetic disk by the recording head.
Claims20
A magnetic disk device comprising:
- a magnetic disk including a recording layer;
- a recording head configured to apply a recording magnetic field to the recording layer;
- and
- a controller configured to control the recording head, wherein
- the recording head includes:
- a main magnetic pole configured to generate the recording magnetic field;
- a return magnetic pole opposed to a tip portion of the main magnetic pole with a write gap therebetween and configured to form a magnetic circuit together with the main magnetic pole by returning magnetic flux from the main magnetic pole;
- a recording coil configured to excite magnetic flux in a magnetic circuit formed by the main magnetic pole and the return magnetic pole;
- a high-frequency oscillator disposed in the write gap;
- and
- a bias voltage application circuit configured to apply a bias voltage to the high-frequency oscillator through the main magnetic pole and the return magnetic pole, and
- the controller includes a bias voltage controller configured to change a bias voltage to be applied to the high-frequency oscillator in accordance with a sampling frequency of data before the data is recorded on the magnetic disk by the recording head.
A magnetic disk device comprising:
- a magnetic disk including a recording layer;
- a recording head configured to apply a recording magnetic field to the recording layer;
- and
- a controller configured to control the recording head, wherein
- the recording head includes:
- a main magnetic pole configured to generate the recording magnetic field;
- a return magnetic pole opposed to a tip portion of the main magnetic pole with a write gap therebetween and configured to form a magnetic circuit together with the main magnetic pole by returning magnetic flux from the main magnetic pole;
- a recording coil configured to excite magnetic flux in the magnetic circuit formed by the main magnetic pole and the return magnetic pole;
- a high-frequency oscillator disposed in the write gap;
- and
- a bias voltage application circuit configured to apply a bias voltage to the high-frequency oscillator through the main magnetic pole and the return magnetic pole, and
- the controller includes a bias voltage controller configured to change the bias voltage in accordance with a radial position of the magnetic disk on which data is recorded, before the data is recorded on the magnetic disk by the recording head.
Dependencies are inferred from the claim text.