Magneto-optical recording medium and device

Abstract

Abstract PURPOSE:To perform overwrite by providing a magnetic layer to perform the recording and holding of information and second, third, and fourth magnetic layers to perform auxiliary recording, recording control and initializing on a substrate, and performing the irradiation of a laser beam and the application of a recording magnetic field. CONSTITUTION:This magneto-optical recording medium 10 is formed by providing a dielectric layer, a first magnetic layer, the second, third, and fourth magnetic layers, and a protective layer on a glass substrate sequentially. Here, adjacent magnetic layers are coupled by the exchanging force. The first magnetic layer is the one to perform the recording and holding of the information. The second, third, and fourth magnetic layers are provided with no role as information media, and are additional layers in which optical modulation overwrite can be performed, and the fourth magnetic layer is an initializing layer in which no inversion of sub grid lattice is formed in an operating range for temperature rise by laser irradiation and with a function against a bias magnetic field. The third magnetic layer interrupts the exchanging force from the fourth magnetic layer at high temperature with a control layer. The recording medium 10 is irradiated with the laser beam from a semiconductor laser 30, and an external magnetic field generator 20 applies the recording magnetic field.

Inventors

• 👤 Yoshiyuki Nakagi
• 👤 義幸 中木
• 👤 Takashi Tokunaga
• 👤 隆志 徳永
• 👤 Kazuhiko Tsutsumi
• 👤 和彦 堤
• 👤 Tatsuya Fukami
• 👤 達也 深見
• 👤 Motohisa Taguchi
• 👤 元久 田口

Bibliographic Details