Presentation Information
[7a-N302-5]Dimension-dependent magnon-magnon interactions
〇(P)Huanhuan Yang1, Gerrit E. W. Bauer1,2 (1.Tohoku University, 2.University of the Chinese Academy of Sciences)
Keywords:
magnon-magnon interactions
We investigate magnon-magnon interactions in ferromagnetic systems across different dimensionalities, emphasizing their sensitivity to geometric confinement. In the long-wavelength limit, dipolar interactions dominate and lead to a suppression of three-magnon processes in reduced dimensions, while four-magnon interactions display distinct scaling behaviors from 1D to 3D. At larger wave vectors, the exchange interaction becomes important, but the corresponding four-magnon interactions are independent of the dimensions. By analyzing the threshold fields for first- and second-order Suhl instabilities, we uncover their dependence on wavevector orientation and dimensionality. Our findings highlight the crucial role of geometric confinement in shaping nonlinear magnon dynamics and provide a route to control spin-wave instabilities in magnets of various dimensions.