Abstract: A method of recording information on and reproducing information from a magnetooptical recording medium which includes first and second magnetic layers. The method includes the step of projecting a light spot onto the medium. When reproducing information, the light spot is projected onto the medium from the side of the magnetic layer. In this method only a high temperature region of the second magnetic layer within a light spot projection portion is changed to a perpendicular magnetization film so that information recorded in the first magnetic layer is transferred to the perpendicular magnetization film of the second magnetic layer. In addition, information which is transferred to the second magnetic layer is detected by using reflected light from the medium which is subjected to the magneto-optic effect from the perpendicular magnetization film of the second magnetic layer.

Abstract: A magnetooptical recording medium includes a first magnetic layer, in which data is to be stored, and a second magnetic layer, wherein the first magnetic layer is perpendicularly magnetizable at both room temperature and a raised temperature above room temperature, and the second magnetic layer is in-plane magnetizable at room temperature and becomes perpendicularly magnetizable at the raised temperature, which is composed of Gd.sub.x (Fe.sub.100-y Co.sub.y).sub.100-x, where 27.ltoreq.x.ltoreq.31 and 28.ltoreq.y.ltoreq.50.

Abstract: An optical recording medium is formed to include a resinous substrate, a laminate film including an inorganic dielectric layer and a recording layer, and a resinous protective film, respectively disposed on the substrate. The laminate film is formed to have a compression stress of 15-55 kg/mm.sup.2 so as to be in a dense film free from cracking or peeling. The resinous protective layer is formed to have a tensile stress of 2.5-5.5 kg/mm.sup.2 so as to compensate the compression stress in the laminate film, thus preventing warp and skew of the optical recording medium. The resinous protective film may preferably be formed from a photocurable composition comprising an increased amount of a polyacrylate compound providing a dense film and a urethane acrylate compound providing a flexibility.

Abstract: In an optical recording medium having an optical recording layer provided on a substrate, a carbide film of a substance selected from among tungsten, boron, molybdenum, hafnium, niobium, titanium, chromium, vanadium, tantalum and silicon is formed on one or each side of the recording layer.

Abstract: An opto-magnetic recording medium comprises a transparent plastic substrate, a magnetic recording layer provided on the plastic substrate, and two or more thin film layers provided between the plastic substrate and the magnetic recording layer and decreasing the reflectance of the magnetic recording layer for a light entering from the substrate side. At least one of the thin film layers except the layer which is in contact with the plastic substrate is formed of Si.sub.3 N.sub.4.

Abstract: In an opto-magnetic recording medium having on a substrate at least a recording layer consisting of an amorphous magnetic material, there is provided between the substrate and the recording layer an undercoated layer comprising a silicon oxide film, a metal film and a nitride film laminated in succession from the substrate side.

Abstract: An optical recording medium having a substrate, an optical recording layer formed on the substrate, and at least one film consisting of a carbide and a nitride and formed on the substrate.

Abstract: An opto-magnetic recording medium comprises a light-transmitting substrate, a first protective layer comprising a metal film provided in contact with the substrate and transmitting therethrough almost all of a light entering through the substrate, a second protective layer formed of a dielectric material provided on the first protective layer, and a magnetic recording layer provided on the second protective layer and having information recorded or reproduced thereon by the light transmitted through the substrate and the first and second protective layers.