photothermal magnetic recording medium

Abstract

Abstract PURPOSE:To improve recording efficiency and reproducing efficiency with a photothermomagnetic recording medium formed with a recording layer consisting of a thin film of an amorphous magnetic alloy having the axis of easy magnetization in the direction perpendicular to the film plane on a base plate by selecting the amorphous magnetic alloy from GdDyFeCo, TbDyFeCo or GdTb-DyFeCo. CONSTITUTION:An amorphous magnetic alloy selected from GdDyFeCo, TbDyFeCo or GdTbDyFeCo is used with a photothermomagnetic recording medium formed with an amorphous magnetic alloy layer having the axis of easy magnetization in the direction perpendicular to the film plane on a base plate. Fe and Co exist preferably in the range of 50-90atm% in the total amt. thereof as the compsn. to provide substantial magnetic anisotropy for directing the axis of easy magnetization in the direction perpendicular to the film plane with such photothermomagnetic recording medium. Said amt. is more particularly preferably 70-85atm%. Co exists preferably by >=0.5atm% with respect to Fe in order for the Kerr rotating angle to attain the value substantially larger than the value by the conventional constituting elements. The film is formed by a sputtering method or vacuum deposition method in order to constitute the amorphous thin film.

Inventors

• 👤 Hiroyoshi Kishi
• 👤 博義 岸
• 👤 Masaaki Matsushima
• 👤 正明 松島

Bibliographic Details