Fuji Electric Co., Ltd.

Fuji Electric Device Technology Co., Ltd.

Takako Matsumoto

Takeshi Watanabe

Kunihiro Imai

Masami Kuroda

Akira Furuta

Kenji Hishinuma

Yoshinori Ozawa

Kazuhiro Kusakawa

A magnetic recording medium includes a nonmagnetic substrate and at least a magnetic layer, a protective layer, and a lubricating layer provided on the nonmagnetic substrate. The magnetic recording medium is characterized in that the lubricating layer is formed of a lubricating agent represented by general formulas (1), (2) or (3), in which substituents R, R, R, and Rin the lubricating agent represent organic groups, at least one of the substituents Rand Rat the end part of the lubricating agent and the substituents Rand Rcontain a plurality of functional groups, and the shortest distance between the functional groups is a distance of three or more atoms, preferably five atoms. The magnetic recording medium may be used for a heat assisted recording method in which the temperature of the magnetic layer reaches 150&#xb0; C. to 200&#xb0; C. The magnetic recording medium is characterized in that the amount of the lubricating agent volatilized in the lubricating layer is less than 10% of the initial layer thickness.

Magnetic recording medium

A magnetic recording medium includes a nonmagnetic substrate provided on which are, in the order recited; an underlayer; a magnetic layer; a protective layer comprised of carbon; and a lubricating layer composed of a lubricant mixture composed of a lubricant represented by Formula (I) below  

Magnetic recording medium, manufacturing method, and use thereof

A method for treating a plurality of magnetic recording media with ultraviolet radiation. Each of the magnetic recording media has a magnetic film, a protective film, and a lubricant film on a non-magnetic substrate. The method includes first irradiating all of the magnetic recording media with ultraviolet radiation and then irradiating a group of the magnetic recording media with ultraviolet radiation, which includes less than all of the magnetic recording media.

Method for treating a plurality of magnetic recording media with ultraviolet rays

A magnetic recording medium for use in a thermally assisted recording system is disclosed. The magnetic recording medium comprises at least a magnetic layer, a protective layer and a lubricant layer formed on a nonmagnetic substrate, wherein a lubricant of the lubricant layer exhibits such a heat resistance that an amount of volatilization when the magnetic layer is heated to a temperature not lower than a temperature Tw is less than 1% with respect to an initial amount of the lubricant in an unheated condition. The present invention addresses a problem of the heat resistance performance of the lubricant for use in magnetic recording media and provides a magnetic recording medium exhibiting high heat resistance.

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Nagano, Japan

Takako Matsumoto