Method for regenerating information from a magneto-optical information recording medium

Abstract

Abstract There is disclosed a magnetooptical recording medium provided with at least a recording layer and a reading layer both composed of magnetic layers showing vertical magnetic anisotropy, in which the recording layer has a higher coercive force and a lower Curie temperature than those of the reading layer at room temperature, wherein the thickness of the recording layer is 1/10 to 1/1000 of the diameter of the magnetic domain formed in the recording layer by information recording, and the reading layer is so positioned with respect to the recording layer that a floating magnetic field emanating from the magnetic domain in the recording layer shows positive and negative peaks in the reading layer in the vicinity of the boundary of the magnetic domain. Secure regeneration of information with a high S/N ratio is possible from such recording medium by irradiating the reading layer with light while applying a magnetic field of which magnitude is larger than the coercive force of the reading layer, smaller than that of the recording layer and smaller than the peak value of the floating magnetic field emanating from the recording layer, and detecting the regenerating light modulated in polarization according to the direction of magnetization of the reading layer.

Inventors

• 👤 Tadashi Kobayashi

Bibliographic Details