Magneto optical recording medium with mask layer

Abstract

A magneto-optical recording medium includes a transparent substrate, an underlying layer, a reproducing layer, a mask layer, a recording layer, and a protection layer. Reproducing layer is an in-plane magnetization film at room temperature and is transformed into a perpendicular magnetization film at about 150° C. Mask layer is an in-plane magnetization film at room temperature and reaches the Curie temperature around 140° C. which is lower than the reproducing temperature. Only the region whose temperature has reached the Curie temperature is demagnetized, and the other region retains the in-plane magnetization. The width of region whose temperature reaches the Curie temperature is substantially equal to the shortest domain length of recording layer. The magnetic domain of recording layer is transferred to reproducing layer 3 through the demagnetized region of mask layer. The leakage magnetic field from the other region of magnetic domain is shielded by mask layer retaining the in-plane magnetization. As a result, if the recording density increases, each magnetic domain of recording layer can be accurately transformed to a reproducing layer and the transferred magnetic domain can be detected.

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