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We report unidirectional transmission of micron-wide spin waves beams in a 55nm thin YIG. We downscaled a chiral coupling technique implementing Ni80Fe20nanowires arrays with different widths and lattice spacing to study thenon-reciprocal transmission of exchange spin waves down to lambda = 80 nm. Afull spin wave spectroscopy analysis of these high wavevector coupled-modesshows some difficulties to characterize their propagation properties, due toboth the non-monotonous field dependence of the coupling efficiency, and alsothe inhomogeneous stray field from the nanowires.

High wave vector non-reciprocal spin wave beams