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MICROWAVE-ASSISTED MAGNETIC RECORDING DEVICE AND METHOD USING NON-CONSTANT MICROWAVE

  • US 20130258514A1
  • Filed: 03/30/2012
  • Published: 10/03/2013
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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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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