| 摘要 |
In a magnetic disk apparatus according to the present invention, a slider has a sliding surface and a reflecting surface. The height of the reflecting surface from the magnetic disk is greater than that of the sliding surface from the disk, when the slider flies above the disk, so that there exists a minute difference in level between the sliding surface and the reflecting surface. The flying height of the sliding surface of the slider from the magnetic disk is measured. When the magnetic disk is rotated, the slider flies from the disk. In this state, a reference flying height, i.e., the flying height of the reflecting surface from the magnetic disk is measured by the optical interference process. Then, the minute difference is substracted from the measured reference flying height to obtain the flying height of the sliding surface of the slider from the magnetic disk. According to the invention, even if the minimum flying height of the sliding surface of the slider is shorter than 0.1 micrometer, the measurement can be effected by the optical interference process. In general, moreover, a minute flying height between a fixed datum plane and an object flying above the datum plane can be measured accurately.
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