| 摘要 |
PURPOSE:To obtain a high efficiency by using a bismuth substitution magnetic garnet film having a large Faraday rotational function, and utilizing the mutual coupling with a magnetostatic wave backward volume wave in which a spin mode is not generated. CONSTITUTION:A bismuth substitution magnetic garnet film 2 is formed on a substrate 1. A subsequently, an input electrode 3in and an output electrode 3 out of a microwave are placed so as to come into contact opposingly or to be opposed on one main face, that is, the surface of this magnetic garnet film 2. Next, by providing a means for applying a bias magnetic field Ha in parallel to this film surface and in the arranged direction of the input and output electrodes 3in, 3out, for instance, from the input electrode 3in to the output electrode 3out, or on the contrary, to a bias magnetic field side, a backward volume wave MSBVW is generated between both the electrodes. Also, an input converting part 4in of light and an output converting part 4 out of light for taking in light so as to execute an interaction with the backward volume wave MSBVW are placed. In such a way, a high efficiency is obtained. |
