Magnetic head and magnetic recording device
First Claim
Patent Images
1. A magnetic head comprising:
- a recording magnetic pole to generate a recording magnetic field;
a spin torque oscillator formed in the vicinity of the recording magnetic pole; and
a magnetic field applying unit configured to apply a magnetic field to the spin torque oscillator,the magnetic field applied to the spin torque oscillator by the magnetic field applying unit being perpendicular to a recording magnetic field generated from the recording magnetic pole.
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Abstract
It is made possible to restrict the variation of the oscillation frequency of a spin torque oscillator placed in the vicinity of the recording magnetic pole. A magnetic head includes: a recording magnetic pole to generate a recording magnetic field; a spin torque oscillator formed in the vicinity of the recording magnetic pole; and a magnetic field applying unit configured to apply a magnetic field to the spin torque oscillator. The magnetic field applied to the spin torque oscillator by the magnetic field applying unit is perpendicular to a recording magnetic field generated from the recording magnetic pole.
213 Citations
23 Claims
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1. A magnetic head comprising:
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a recording magnetic pole to generate a recording magnetic field; a spin torque oscillator formed in the vicinity of the recording magnetic pole; and a magnetic field applying unit configured to apply a magnetic field to the spin torque oscillator, the magnetic field applied to the spin torque oscillator by the magnetic field applying unit being perpendicular to a recording magnetic field generated from the recording magnetic pole. - View Dependent Claims (2, 3, 4, 5, 6, 19, 20, 21, 22, 23)
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7. A magnetic head comprising:
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a recording magnetic pole to generate a recording magnetic field; a spin torque oscillator formed in the vicinity of the recording magnetic pole; and a magnetic field applying unit provided at either end portion of the spin torque oscillator in a direction perpendicular to a direction parallel to a line connecting the recording magnetic pole and the spin torque oscillator in a plane parallel to an air bearing surface, the magnetic field applying unit configured to apply a magnetic field to the spin torque oscillator, the spin torque oscillator including; a first magnetic layer comprising at least one layer of magnetic film; a second magnetic layer comprising at least one layer of magnetic film; an intermediate layer provided between the first magnetic layer and the second magnetic layer; and an electrode comprising a first electrode layer placed on a face of the first magnetic layer on the opposite side from the intermediate layer, and a second electrode layer placed on a face of the second magnetic layer on the opposite side from the intermediate layer, the electrode being capable of applying a current flowing in a direction perpendicular to film planes of the first magnetic layer, the intermediate layer, and the second magnetic layer, the first electrode layer, the first magnetic layer, the intermediate layer, the second magnetic layer, and the second electrode layer being stacked in a direction parallel to a direction connecting the two end portions of the spin torque oscillator. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A magnetic head comprising:
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a recording magnetic pole to generate a recording magnetic field; a spin torque oscillator formed in the vicinity of the recording magnetic pole; and a magnetic field applying unit provided at either end portion of the spin torque oscillator in a direction perpendicular to a direction parallel to a line connecting the recording magnetic pole and the spin torque oscillator in a plane parallel to an air bearing surface, the magnetic field applying unit configured to apply a magnetic field to the spin torque oscillator, the spin torque oscillator including; a first magnetic layer comprising at least one layer of magnetic film; a second magnetic layer comprising at least one layer of magnetic film; an intermediate layer provided between the first magnetic layer and the second magnetic layer; and an electrode comprising a first electrode layer placed on a face of the first magnetic layer on the opposite side from the intermediate layer, and a second electrode layer placed on a face of the second magnetic layer on the opposite side from the intermediate layer, the electrode being capable of applying a current flowing in a direction perpendicular to film planes of the first magnetic layer, the intermediate layer, and the second magnetic layer, the first electrode layer, the first magnetic layer, the intermediate layer, the second magnetic layer, and the second electrode layer being stacked in a direction perpendicular to a direction connecting the two end portions of the spin torque oscillator. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification