| 摘要 |
A recording film is formed on a surface of a substrate, including the slopes, which are positioned on both sides of each information track and have surfaces not parallel to the surfaces of the information tracks. The surface of the substrate is sputter-etched by accelerated ions impinging against the substrate surface in a substantially vertical direction. The recording film on each slope is etched away based on the dependence of a sputtering rate upon an incident angle of the ions, while the recording film remains on the surface of each information track.
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