Abstract: A storage medium including a servo layer, a data recording layer, a heat sink layer, and a diamond-like carbon layer with a lubricant covering. The servo layer is configured to store servo information on the storage medium. The servo information is used to position a read/write head over the storage medium during a read/write operation performed by the read/write head on the storage medium. The data recording layer is configured to store data on the storage medium during the read/write operation performed by the read/write head on the storage medium. The heat sink layer is disposed between the servo layer and the data recording layer. The diamond-like carbon layer with the lubricant covering is disposed above the data recording layer.

Abstract: A magneto-optic recording medium has a stacked structure composed of a memory layer, a domain wall displacement layer having domain wall-resistant magnetism smaller than the memory layer, and a switching layer having a lower Curie temperature than these layers interposed between these layers. A recording surface of the magneto-optic recording medium is divided into a plurality of tracks of a predetermined track pitch. A domain wall displacement layer has a recording track region limited in a track width direction in a central portion of each track. A magnetized state of a vertically magnetized memory layer is only transferred in the recording track region. A buffer region is magnetically oriented in an in-plane direction at a predetermined temperature or lower and is vertically magnetized at the predetermined temperature or higher.

Abstract: A magneto-optical recording medium has a recording layer and a reflective layer on a substrate. The recording layer has a layered structure in which at least one spinel ferrite (or rutile-type oxide or hematite) layer and at least one garnet ferrite layer are piled together. It is preferable that the layered structure is formed on tracks where data are recorded. A manufacturing method comprises the steps of heat treatment in the range of 500-700° C., preferably 600-630° C., after the formation of the recording layer. In the magneto-optical recording and playback device to record and play back data, the wavelength of light for recording data is different from that for reading data, which is preferable for a magneto-optical recording medium comprising a garnet ferrite layer.