Magnetic recording medium

Abstract

Abstract PURPOSE:To obtain a magnetic recording medium which is improved in the crystal orientability and magnetic characteristics of a magnetic medium layer, increases 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 formed on the nonmagnetic substrate 1 consisting of an aluminum alloy, etc. and the surface thereof is finished to a specular surface to improve the surface hardness and accuracy of the substrate 1. The nonmagnetic underlying layer 3 is then formed by sputtering one kind among Si, Ti, Mo, W and Zr on the layer 2 within a range of 50-2,400Angstrom thickness. The ferromagnetic medium layer 4 consisting of gamma-Fe2O3, Co, Co alloy, etc. is formed on the layer 3. The crystal orientability and magnetic characteristics of the magnetic medium are made better by providing the layer 3 than in the case of providing directly the magnetic medium layer 4 on the layer 2. The number of times of CSS is thus increased and the high reliability magnetic disk or the like is obtd.

Inventors

• 👤 Tomoji Morita
• 👤 森田　知二
• 👤 Mitsumasa Umezaki
• 👤 梅崎　光政
• 👤 Hirobumi Ouchi
• 👤 博文 大内
• 👤 Isato Nishinakagawa
• 👤 西中川　勇人
• 👤 Yasuhiro Okamura
• 👤 康弘 岡村
• 👤 Teruji Futami
• 👤 二見　照治

Bibliographic Details