Propagation of Spin Waves in Intersecting Yttrium Iron Garnet Nanowaveguides

Bratschitsch R.; Michaelis De Vasconcellos S.; Pernice W.H.P.; Demokritov S.O.; Demidov V.E.; Raskhodchikov D.; Bensmann J.; Nikolaev K.O.; Lomonte E.; Jin L.; Steeger P.; Preuß J.A.; Schmidt R.; Schneider R.; Kern J.

Abstract

We study experimentally the propagation of spin waves in waveguide structures consisting of two submicrometer-width yttrium iron garnet waveguides intersecting at a right angle. We show that, despite the significant spatial variations of the internal static magnet field and the in-plane anisotropy of the dispersion characteristics, the incident spin wave can efficiently pass through the microscopic cross-shaped structure and be transmitted into all its arms. This process depends strongly on the frequency of the wave and the orientation of the static magnetic field. By varying these parameters, one can achieve a controllable uniform or preferential transmission of the wave into different arms of the cross. Our results create the basis for the implementation of nanoscale magnonic networks to be used for the realization of complex non-Boolean data-processing schemes, including neuromorphic computing.