Laser micro-processing as a tool for constructing insulator-based magnonic crystal

絶縁体を用いたマグノン結晶構築のためのレーザーマイクロ加工

大門 俊介*; 井口 亮*; 内田 健一*; 齊藤 英治

Daimon, Shunsuke*; Iguchi, Ryo*; Uchida, Kenichi*; Saito, Eiji

YFeO (YIG) films with a periodic-antidot-array structure fabricated by laser microprocessing is shown to exhibit clear characteristics of two-dimensional (2D) magnonic crystals. The experimental results demonstrate that the spin-wave-resonance spectra in the YIG films are modulated by the periodic antidot structure. The frequency and lattice constant dependences of the spectra are well reproduced by a numerical calculation based on magnonic band structures of the 2D magnonic crystals. Since the laser micro-processing is compatible with various thin-film fabrication methods, it can be a powerful tool for constructing magnonic crystals.