Intensity and magnetization angle reconfigurable lateral spin-wave coupling and transport

Abstract

Magnonic directional coupler is important unit of the integrated functional magnonic networks. Here we report on the mechanism of the variation of the spin-wave coupling length which is equal to the longitudinal spatial scale of wave intensity modulation along the magnonic stripes placed in the proximity. The array of yttrium-iron garnet films was proposed to be the main unit of the magnonic directional coupler system. The simultaneous variation of the magnetization orientation and spin-wave intensity leads to the variation of spin-wave coupling length. Using the finite element numerical simulation and numerical integration of the phenomenological equations similar to the nonlinear Ginzburg-Landau equations the dispersion and frequency dependences of the spin wave coupling length were obtained. We also demonstate experimentally the simultaneous control of spin-wave transport by the variation of the signal intensity and magnetization angle. It was shown that the proposed dual-mode control can enhance the functionality of directional coupler, power splitter and multiplexer based on coupled stripes in planar magnonic networks.