| 摘要 |
PURPOSE: To obtain a magnetic recording medium with a lower noise, a higher output and a high density recording made possible by arranging a magnetic layer to be a lamination of more than one magnetic layers for a higher coercive force of the lower magnetic layer than that of the upper magnetic layer. CONSTITUTION: A substrate 1 is made of vitreous carbon, and a Ti ground layer 2 with a thickness of 1,000Åis provided thereon and a Cr ground layer 3 with a thickness of 450Åthereon by a magnetron sputtering device. A CoCrTa magnetic layer 4 with 1 thickness of 500Åor less is provided on the ground layer 3 using a DC magnetron sputtering device. A CoCrPt magnetic layer 5 with a thickness of 500Åor less is formed on the magnetic layer 4 using the DC magnetron sputtering device. Moreover, a carbon protective layer 6 and a perfluoroether based lubricant layer 7 are provided thereon. The thickness/total thickness of all magnetic layers of the CoCrTa magnetic layer 4 as lowest layer is 0.4 or below. This enables the obtaining of a magnetic recording medium with a lower noise, a higher output and a high density recording made possible.
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