MICROWAVE-ASSISTED MAGNETIC RECORDING DEVICE AND METHOD USING NON-CONSTANT MICROWAVE
First Claim
1. A magnetic recording device, comprising:
- a magnetic disk;
a magnetic head that performs magnetic recording to the magnetic disk, including;
a main magnetic pole layer that generates a recording magnetic field synchronizing recording current generated by recording voltage corresponding to recording signals and that applies the recording magnetic field to the magnetic disk; and
a microwave generating element that is arranged in a vicinity of the main magnetic pole layer and that applies a microwave magnetic field to the magnetic disk during magnetic recording; and
a microwave generating element driving current control circuitthat, during the magnetic recording, applies a microwave generating element driving current at a first current level to the microwave generating element for a period that is from at the latest a polarity reversal of the recording current before a subsequent polarity reversal of the recording voltage, and thereafterthat applies another microwave generating element driving current at a second current level, which is smaller than the first current level, to the microwave generating element, or stops the application of the another microwave generating element driving current until the polarity reversal of the recording voltage.
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Accused Products
Abstract
A magnetic recording device includes a magnetic disk and a magnetic head that performs magnetic recording to the magnetic disk. The magnetic head includes a main magnetic pole layer and a microwave generating element. The magnetic recording device further includes a microwave generating element driving current control circuit. The microwave generating element driving current control circuit, during the magnetic recording, applies a microwave generating element driving current at a first current level to the microwave generating element for a period that is from at the latest a polarity reversal of the recording current before a subsequent polarity reversal of the recording voltage, and thereafter applies another microwave generating element driving current at a second current level, which is smaller than the first current level, to the microwave generating element, or stops the application of the another microwave generating element driving current until the polarity reversal of the recording voltage.
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Citations
10 Claims
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1. A magnetic recording device, comprising:
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a magnetic disk; a magnetic head that performs magnetic recording to the magnetic disk, including; a main magnetic pole layer that generates a recording magnetic field synchronizing recording current generated by recording voltage corresponding to recording signals and that applies the recording magnetic field to the magnetic disk; and a microwave generating element that is arranged in a vicinity of the main magnetic pole layer and that applies a microwave magnetic field to the magnetic disk during magnetic recording; and a microwave generating element driving current control circuit that, during the magnetic recording, applies a microwave generating element driving current at a first current level to the microwave generating element for a period that is from at the latest a polarity reversal of the recording current before a subsequent polarity reversal of the recording voltage, and thereafter that applies another microwave generating element driving current at a second current level, which is smaller than the first current level, to the microwave generating element, or stops the application of the another microwave generating element driving current until the polarity reversal of the recording voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A magnetic recording method, comprising:
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generating a recording current by a recording voltage corresponding to a recording signal; generating a recording magnetic field synchronizing the recording current; and applying the recording magnetic field and a microwave magnetic field simultaneously to a predetermined region of a magnetic disk so that magnetic recording to the magnetic disk is performed, wherein during the magnetic recording, a microwave generating element driving current at a first current level is applied to the microwave generating element for a period that is from at the latest a polarity reversal of the recording current before a subsequent polarity reversal of the recording voltage, and thereafter, another microwave generating element driving current at a second current level, which is smaller than the first current level, is applied to the microwave generating element or the application of the another microwave generating element driving current is stopped until the polarity reversal of the recording voltage. - View Dependent Claims (7, 8, 9, 10)
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Specification