Patent ID: 6122228
Filing Date: 2000-09-19
Classification: G11B

Abstract:
A method for performing reproduction on a magneto-optical recording medium for reproducing a recorded signal by irradiating the magneto-optical recording medium with a reproducing light beam to detect magnitude of an magneto-optical effect, the reproducing method comprising the steps of:using, as the magneto-optical recording medium, a magneto-optical recording medium comprising a magneto-optical recording film having perpendicular magnetization, an auxiliary magnetic film which causes transition from an in-plane magnetizable film to a perpendicularly magnetizable film when a temperature exceeds a critical temperature Tcr and a non-magnetic film intervened between the magneto-optical recording film and the auxiliary magnetic film, the magneto-optical recording medium having a magnetic characteristic to satisfy a relationship of room temperature<Tcr<Tcomp<Tco<Tc concerning a Curie temperature Tco of the magneto-optical recording film and a Curie temperature Tc and a compensation temperature Tcomp of the auxiliary magnetic film; andexecuting reproduction of the recorded signal through the steps of irradiating the magneto-optical recording medium with the reproducing light beam which is power-modulated to have at least two light powers of Pr.sub.1 and Pr.sub.2 at the same cycle as that of a reproducing clock or at a cycle created by the multiplication of an integer and the reproducing clock while applying a DC magnetic field so that a recording magnetic domain in the magneto-optical recording film is transferred to the auxiliary magnetic film, the transferred magnetic domain is magnified, and the magnified magnetic domain is reduced or extinguished, wherein:the magneto-optical recording medium is specified, under a condition in which an external magnetic field Hex is applied to the magneto-optical recording medium, such that a temperature curve A of a transfer magnetic field which is generated by the external magnetic field Hex and the magneto-optical recording film, and a temperature curve B of a coercive force of the auxiliary magnetic film in a perpendicular direction intersect at a point between room temperature and the compensation temperature Tcomp of the auxiliary magnetic film, and the temperature curve A and the temperature curve B intersect at a point between the compensation temperature Tcomp of the auxiliary magnetic film and the Curie temperature Tco of the magneto-optical recording film.