High wave vector non-reciprocal spin wave beams

We report unidirectional transmission of micron-wide spin waves beams in a 55 nm thin YIG. We downscaled a chiral coupling technique implementing Ni80Fe20 nanowires arrays with different widths and lattice spacing to study the non-reciprocal transmission of exchange spin waves down to lambda asymptotic to 80 nm. A full spin wave spectroscopy analysis of these high wavevector coupled-modes shows some difficulties to characterize their propagation properties, due to both the non-monotonous field dependence of the coupling efficiency, and also the inhomogeneous stray field from the nanowires. (c) 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/9.0000535

Automated summary

We demonstrate the unidirectional transmission of micron-wide spin wave beams in a 55 nm thin YIG. By using a downscaled chiral coupling technique with Ni80Fe20 nanowire arrays of various widths and lattice spacing, we investigate the non-reciprocal transmission of exchange spin waves with wavelengths down to 80 nm. However, the characterization of the propagation properties of these highly wavevector-coupled modes is challenging due to the non-monotonous field dependence of the coupling efficiency and the inhomogeneous stray field from the nanowires.