Patent ID: 6980491
Filing Date: 2005-12-27
Classification: G11B

Abstract:
1. A magneto-optical recording medium having a plurality of information tracks comprising: a substrate, each of the information tracks having portions used for recording and reproducing information in the form of a magneto-optical signal and portions having pre-pits formed therein alternately arranged; and at least first, second and third magnetic layers laminated on the substrate, wherein the first magnetic layer has a domain wall coercivity smaller than that of the third magnetic layer, the second magnetic layer has a Curie temperature lower than that of the first magnetic layer and the third magnetic layer, and directions of magnetization of the third magnetic layer are aligned above the portions having the pre-pits and wherein regions in which the directions of magnetization are aligned are only areas in the portions having the pre-pits which immediately precede the portions used for recording and reproducing information in the form of an magneto-optical signal, and in the remaining areas in the portions having the pre-pits, the direction of magnetization of the third magnetic layer is polarized according to a predetermined signal pattern within a signal bandwidth used for recording and reproducing information.