| 摘要 |
PROBLEM TO BE SOLVED: To close up a mark pitch and a track pitch with a simple layer structure by successively laminating a reproducing magnetic layer, a recording layer, a photoconductive layer and a magnet layer from the light beam incidence side. SOLUTION: A GdFe film having 30 nm thickness, a TbFeCo film having 60 nm thickness, a CuO film having 100 nm thickness, a GdTbFeCo film having 50 nm thickness are used as a reproducing layer 11, a recording layer 12, a photoconductive layer 13 and a magnet layer 14, respectively. The magnetization of the recording layer 12 is aligned upward, when a large quantity of conductive electrons are formed in the photoconductive film in a part rich in number of photons near the central part of a spot during irradiation with recording light, an exchange magnetic field in the part exceeds the coercive force of the recording layer, the exchange magnetic field is dominant and the sum of vectors of the magnetic field is upward. The size of recording marks is decided by a part in which the photoconductivity of the photoconductive film increases, marks having a size smaller than that of the total half-width of a laser spot can be formed and high density recording is realized.
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