| 摘要 |
According to one embodiment, it is determined whether a STOAR element which performs microwave assistance for a magnetic disk apparatus is made to oscillate properly. When the STOAR element is oscillating when a current bias is applied, the resistance of the element increases. Therefore, in a head IC which outputs the current bias, a voltage applied to the STOAR element is sensed, and it is possible to determine that the STOAR element is oscillating when the voltage is increased to a threshold or more. Conversely, it is possible to determine that the STOAR element is not oscillating when the voltage is less than the threshold. In addition, it is possible to determine that oscillation has diminished, when the resistance decreases after the voltage reaches the threshold or more. Therefore, it is possible to make the STOAR element oscillate normally again, by boosting the STOAR element by a current.
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