Design of a Coplanar-Waveguide-Based Microwave-to-Spin-Wave Transducer

Abstract

Spin waves are an emerging alternative to electrical signals for high-speed computing. One approach to realizing spin-wave computing devices is to make use of the diffraction and interference of spin waves in a magnetic thin film. This new class of device requires spin wave transducers that operate across a relatively wide bandwidth. Coplanar-waveguide-based transducers would typically be unsuitable for this application due to their comb-like frequency response. Our simulations show that if the coplanar waveguide (CPW) is placed to the side of the edge of a magnetic film, the frequency response is greatly improved at the expense of peak transducer efficiency. We also found that the CPW on top of the film with an etched gap in the film to the side of the waveguide can be a more efficient transducer for shorter decay lengths.