| 摘要 |
When it is assumed that A is an area value of an absorption spectrum of a wavelength 2940 cm-1 to 2800 cm-1 when the magnetic layer surface is measured by the attenuated total reflectance measurement method using the Fourier transform infrared spectroscopy and B is an area value of an absorption spectrum of a wavelength 2940 cm-1 to 2800 cm-1 when the magnetic layer surface without the lubricant layer is measured by the attenuated total reflectance measurement method using the Fourier transform infrared spectroscopy, a value (A-B) is in a range not less than 0.01 and not greater than 0.30. This enables to accurately evaluate a lubricant amount on the magnetic layer surface and to simultaneously obtain an excellent running durability and an excellent electro-magnetic conversion characteristic.
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