Photoelectromagnetic recording medium

Abstract

Abstract PURPOSE:To enhance remarkably the magnetooptical capability index with the multiple reflection in a transparent magnetic film and to increase the reading performance by coating, in specified thickness, a transparent magnetic film having a large Faraday rotational angle on the surface of a magnetic film having high coercive force. CONSTITUTION:The plane of polarization of the incident linear polarized light is rotated by a magnetic garnet film 2 to an angle of thetarg, rotated at the surface of an R-T amorphous film 3 to an angle of thetara, and again rotated at the garnet film 2 to an angle of thetarg. And the angle of rotation is further increased by the multiple reflection at the magnetic garnet film 2. The photoelectromagnetic recording medium is prepared by growing the magnetic garnet film 2 (BiYbSm)3- (FeGa)5O12, for example, on a GGG substrate 1 with the LPE method, then depositing an R-T amorphous film 3 such as a Tb-Fe film with a high-frequency sputtering method, and further coating an SiOx film 4 as a protective film. Since the rotational angle thetarg of the plane of polarization due to the Bi-substituted garnet film is negative, the composition is regulated (Fe-rich) so that the rotational angle thetarg of the plane of polarization due to the Tb-Fe film may be negative.

Inventors

• 👤 Yuuko Yokoyama
• 👤 横山　侑子
• 👤 Sonoko Tsukahara
• 👤 塚原　園子
• 👤 Toshio Tanaka
• 👤 敏雄 田中

Bibliographic Details