| 摘要 |
PURPOSE:To eliminate the need for a means for impressing an external magnetic field to the titled medium by forming a high magnetic permeability magnetic material layer, projections consisting of a 1st perpendicularly magnetized film, recording layer consisting of a 2nd perpendicularly magnetized film, and protective layer consisting of dielectrics on a substrate. CONSTITUTION:The high magnetic permeability magnetic material layer 2 is formed on the substrate 1 and the projections 3 consisting of the 1st perpendicularly magnetized film having magnetic anisotropy in the direction perpendicular to the film plane are formed at specified intervals thereon. The recording layer 4 consisting of the 2nd perpendicularly magnetized film and the protective layer 5 consisting of the dielectrics are then formed in this order thereon. The high magnetic permeability magnetic material layer 2, the projections 3 consisting of the perpendicularly magnetized film formed via an insulator layer 5 and the recording layer 4 consisting of the 2nd perpendicularly magnetized film are previously magnetized in the same perpendicular direction. The recording layer 4 is then initially magnetized in one direction and a bias magnetic field is impressed to the recording layer 4 part existing between the projections 3 in the direction opposite from the initial magnetization direction by the magnetization of the projected parts. The layer 2 acts to efficiently guide the bias magnetic field to the recording layer 4 part. Inverted magnetic domains are thus formed only by heating up the medium with a laser beam without requiring the means for impressing the external magnetic field to the medium.
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