| 摘要 |
PROBLEM TO BE SOLVED: To obtain a magnetic recording device which is highly practical and has high coercive force by specifying the specific resistance of a conductive thin film on a nonconductive nonmagnetic substrate having high durable temp. to a specified value or lower. SOLUTION: This magnetic recording medium 1 is produced by successively depositing an ITO conductive thin film 3, roughness controlling layer 4, base layer 5, magnetic layer 6, protective layer 7 and lubricating layer 8 on a quartz glass substrate 2. The quartz glass substrate 2 endures high temp. as >=400 deg.C. This is because the heat treatment to obtain a conductive thin film 3 having low resistivity is usually performed at >=400 deg.C and the substrate is required to have heat resistance against that temp. Also the heat resistance of the substrate 2 is important considering the heat treatment carried out to improve magnetic characteristics of the magnetic layer. The resistivity of the conductive thin film 3 is controlled to <=10Ωcm. If it exceeds 1Ωcm, such problems occur that voltage reduction is caused, bias voltage is not uniformly applied on the substrate surface, irregular coercive force is produced in the magnetic layer 6 and effective bias voltage is not applied.
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