講演情報
[8a-E208-5]Double anticrossings induced by nonlinear magnon interactions
〇Geil Emdi1, Tomosato Hioki2,1,3, Koujiro Hoshi3,2, Takahiko Makiuchi1, Aoi Yamauchi2, Eiji Saitoh2,1,3,4 (1.RIKEN CEMS, 2.Dept. Appl. Phys. Univ. Tokyo, 3.AIMR Tohoku Univ., 4.Inst. AI and Beyond Univ. Tokyo)
キーワード：
Magnetization dynamics、Spin Waves、Three-magnon interaction
Parametric coupling enables coherent energy exchange between spin-wave excitations and underpins phenomena such as amplification and squeezing. Extending such interactions to multimode regimes is important for advanced magnonic architectures. Here, we demonstrate multimode parametric coupling in a Permalloy thin-film system driven by propagating spin waves. Using microwave transmission spectroscopy, we map the response as a function of probe and pump frequency and observe pump-induced double anticrossings involving the Kittel mode. The anticrossing gaps and central frequencies exhibit clear pump-power dependence, indicating their nonlinear origin. We attribute these observations to nondegenerate three-magnon splitting of finite-wavevector magnons, generating two standing-wave modes that are parametrically coupled to the Kittel mode. Our results demonstrate multiple coupling channels generated by nonlinear spin-wave dynamics within a single magnetic system.