A magneto-optical disk apparatus generates magnetic field onto a magneto-optical
recording medium prior to recording signals in the magneto-optical recording medium
having a recording layer and a reproduction layer, by use of magnetic field and
laser beam. The magneto-optical apparatus then adjusts a position of a magnetic
head that generates the magnetic field, under a state where the laser beam is irradiated,
by utilizing that an irradiation spot of the laser beam deviates due to eccentricity
of the magneto-optical recording medium. This position adjustment is carried out
based on, for example, a beam position signal showing the irradiation spot of the
laser beam and/or a detection signal which is detected after the laser beam is
modulated by the magnetic field.
