Patent ID: 9666216
Date: 2017-05-30
CPC Classifications: G11B

Claim:
1. A magnetic recording device, comprising: a magnetic recording medium; a microwave assisted magnetic head having a main magnetic pole for generating a recording magnetic field to apply to the magnetic recording medium while recording signals on the magnetic recording medium, and a spin torque oscillator provided near the main magnetic pole for generating a microwave magnetic field to apply to the magnetic recording medium in a superimposed manner on the recording magnetic field; a recording current supply part for supplying a recording current for generating the recording magnetic field from the main magnetic pole to recording coils for exciting the main magnetic pole according to recording current waveform data created based on the signals; a drive current supply part for supplying a drive current to the spin torque oscillator; and a drive current control part for controlling a supply of the drive current by the drive current supply part based on the recording current waveform data, wherein the drive current control part controls the supply of the drive current by the drive current supply part to not substantially lower a quality of the signals recorded on the magnetic recording medium considering as an indicator whether a polarity reversal interval included in the recording current waveform data and defined as a time from one polarity reversal to a next polarity reversal exceeds a threshold time.