Abstract: 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 R1, R2, R3, and R4 in the lubricating agent represent organic groups, at least one of the substituents R1 and R2 at the end part of the lubricating agent and the substituents R3 and R4 contain 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° C. to 200° C.

Abstract: 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 where m is an integer equal to or greater than 1, and R1 and R2 are divalent straight chains consisting of both —CH2 CF2 — or both —CH2 CF2CF2—; and a lubricant represented by Formula (II) below where p and q are integers equal to or greater than 0, provided that p =q =0 is excluded. A method of manufacturing the magnetic recording medium is likewise disclosed.

Abstract: A magnetic recording medium, that makes it possible to reduce head flying height, includes a nonmagnetic substrate and provided thereon, in the order recited; an underlayer; a magnetic layer; a protective layer comprised of carbon; and a lubricating layer composed of a lubricant mixture including a lubricant represented by Formula (I) below where m is an integer equal to or greater than 1; and a lubricant represented by Formula (II) below where p and q are integers equal to or greater than 0, provided that p=q=0 is excluded.

Abstract: 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.

Abstract: A method and an apparatus for treating multiple magnetic recording media with ultraviolet radiation from a UV lamp stored in an UV lamp house. The media are stored in a cassette and are individually placed in the UV lamp house for irradiation. Each of the media has a magnetic film, a protective film, and a lubricant film on a non-magnetic substrate. A curtain shields the inside of the UV lamp house from air exterior to the UV lamp house while the media are inserted and removed respectively into and from the UV lamp house. The cassette is set at a distance from the curtain that is within the range of 6 mm to 13 mm while the media are irradiated in the UV lamp house.

Abstract: 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.

Abstract: A method and apparatus for treating a magnetic recording medium having a magnetic film, a protective film, and a lubricant film on a non-magnetic substrate, with UV radiation. The method includes holding the medium with a resin while irradiating the medium with UV radiation. The apparatus includes a UV irradiation part for irradiating the medium by a UV lamp and a holding part made of resin.

Abstract: 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.

Abstract: 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 R1, R2, R3, and R4 in the lubricating agent represent organic groups, at least one of the substituents R1 and R2 at the end part of the lubricating agent and the substituents R3 and R4 contain 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° C. to 200° C.

Abstract: 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.