| 摘要 |
PURPOSE:To eliminate the need for a means for impressing an external magnetic field to the titled medium by forming projections consisting of a 1st perpendicularly magnetized film at specified intervals onto a substrate and forming a recording layer consisting of a 2nd perpendicularly magnetized film and protective layer consisting of dielectrics thereon. CONSTITUTION:The projections 2 which consist of the 1st perpendicularly magnetized film having magnetic anisotropy in the direction perpendicular to the film plane are formed at the specified intervals onto the substrate 1, then the recording layer 3 consisting of the 2nd perpendicularly magnetized film and the protective layer 4 consisting of the dielectrics are formed in this order thereon. The projections 2 consisting of the perpendicularly magnetized film formed on the substrate 1 and the recording layer 3 consisting of the 2nd perpendicularly magnetized film are previously magnetized in the same perpendicular direction, by which the recording layer 3 is initially magnetized in one direction. A bias magnetic field is impressed by the magnetization of the projected parts to the recording layer 3 part existing between the projections 2 in the direction opposite from the direction of the initial magnetization. Inverted magnetic domains are thereby formed only by the heating up by laser beam projection without requiring the means for impressing the external magnetic field to the medium.
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