| 摘要 |
PURPOSE:To provide wear resistance sufficient for practical use by forming the surface layer of the vertically magnetized film with a layer consisting essentially of Co2O3. CONSTITUTION:The surface layer of the vertically magnetized film is formed with a layer consisting essentially of Co2O3. The layer consisting essentially of Co2O3 can be recognized by the fact that a peak characteristic of Co, CoO, Co3O4, and Co(OH)2 is not seen or is not predominant in the measurement of a cobalt atom by XPS (X-ray Photoelectron Spectroscopy) and only the peak characteristic of Co2O3 can be observed. Although the thickness of the layer consisting essentially of Co2O3 is preferably decreased not to increase a spacing loss, some thickness is needed to impart sufficient wear resistance. Accordingly, the thickness is preferably controlled to 50-500Angstrom .
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