Patent ID: 7145847

Claim:
A method of manufacturing a magneto-optical recording medium that includes: a substrate having lands and grooves; a recording layer formed on the substrate; at least two rows of information tracks adapted to record therein or reproduce therefrom information and formed in the recording layer on the lands or grooves; and denatured regions formed on the lands or grooves and between the information tracks, wherein the medium is a domain wall displacement type magneto-optical medium in which the recording layer includes at least a domain wall displacement layer, a switching layer, and a recording-and-holding layer, and wherein the denatured regions are areas in which magnetism is changed through an annealing processing, the method comprising the steps of: applying two sub-beams and a main beam for annealing onto the recording layer, the main beam being located between the two sub-beams; performing a first tracking control of receiving a reflected light of the main beam from the medium by a detection element which is divided into at least two parts in a radial direction of the medium and carrying out tracking control on the basis of outputs from the divided detection element; performing a second tracking control of receiving reflected lights of the two sub-beams from the medium by two detection elements and carrying out tracking control on the basis of a difference in output between the two detection elements; and switching over between the first tracking control and the second tracking control to anneal a desired position of the grooves or lands.