Spin wave excitation and detection using different meander-shaped antennas: experiment and simulation

The excitation and detection of spin waves (SWs) with specific wavenumbers is very important not only for fundamental SW research but also for the development of future SW devices. Conventional SW theoretical and numerical studies focused on the excitation of dynamic magnetization in waveguides, and did not address the practical limitations imposed by the geometry and configuration of the detection antenna. Using the finite element method, we calculated the induced current with meander-shaped antennas on the detection side, and succeeded in simulating the wavenumber filter effect of SW signals on detection. This was confirmed using experimental measurements on permalloy waveguides. In addition, we investigated, using simulation and experimentally, the effects of combinations of different meander-shaped antennas and broadband signal-ground antennas for excitation and detection. It is found advantageous to set the meander antenna on the detection side to enable filtering and selectivity of SW wavenumber. These findings are important for the development of SW devices.