to provide an information recording method , an information recording apparatus and an information reproducing method and an apparatus for a domain wall mobile type magneto - optical medium . in the information recording method , a light beam scans on the medium for heating and at the same time a magnetic field modulated corresponding to the information is applied to a heated point , and a recording magnetic domain having an arc - shaped magnetic domain wall bending convex in a forward direction of an operation of the light beam is formed so that the information is recorded . the information recording apparatus , includes an optical head to radiate the light beam for executing the information , a magnetic head to generate a magnetic field modulated corresponding to the information , and a unit for causing the optical head , the magnetic head and the medium to relatively move .