| 摘要 |
PURPOSE:To obtain high light transmittance with respect to the wavelength band of 0.8mum, by providing a composition, which does not include Fe<2+>, in bismuth substituted yttrium magnetic garnet. CONSTITUTION:On a garnet substrate, whose light absorption is small, the magnetic garnet having the following specified composition is formed by liquid phase epitaxial growing from a solution comprising only Bi2O3 and garnet constituting element: Y3-x-delta1 Bix Mdelta1I Fe5-y-delta2-delta3 Mdelta2II MyIII Ptdelta3 O12-delta4 (MI is one or more kinds of any of Ca<2+>, Sr<2+> and Ba<2+>; MII is one or more kinds of any of Be<2+> and Mg<2+>; and MIII is one or more kinds of any of Ga<3+> and Al<3+>.) The garnet has high transmittance in the wavelength band of 0.8mum. The garnet is suitable as a Faraday rotary element in a light isolator for preventing returning light when a semiconductor laser using the 0.8mum wave length band is used as a light source for a recording and reproducing device of optical disks and optical and magnetic disks. |
