| 摘要 |
PURPOSE:To obtain a magnetic recording medium which is improved in the crystal orientability and magnetic characteristics of a magnetic medium layer, is increased in the number of times of CSS and has a good squareness ratio by providing a specific nonmagnetic underlying layer on a nonmagnetic substrate via a nonmagnetic hardened layer and providing the magnetic medium layer on the underlying layer. CONSTITUTION:The nonmagnetic hardened layer 2 consisting of an alumite film, etc. is provided on the nonmagnetic substrate 1 consisting of an Al alloy, etc. in order to improve the surface hardness and accuracy of the substrate 1 and is finished to a specular surface. The nonmagnetic underlying layer 3 is then formed of one kind among ZrO2, ZrC and ZrN within a range of 50-2,400Angstrom film thickness. The ferromagnetic medium layer 4 consisting of Co, Ni, Fe or the alloy thereof, iron oxide, chromium oxide, etc. is formed on the layer 3. The crystal orientability and magnetic characteristics of the layer 4 are made better by providing the layer 3 than in the case of forming directly the magnetic medium layer 4 on the layer 2. The magnetic disk or the like which has the good squareness ratio and can increase the number of times of CSS is obtd.
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