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We theoretically investigate the interlayer dipolar and exchange couplingsfor an array of metallic magnetic nanowires grown on top of an extendedultrathin yttrium iron garnet film. The calculated interlayer dipolar couplingagrees with observed anticrossings [Chen \emph{et al.}, Phys. Rev. Lett.\textbf{120}, 217202 (2018)], concluding that the interlayer exchange couplingis suppressed by a spacer layer between the nanowires and film. The Kittel modein the nanowire array couples chirally to spin waves in the film, even thoughDamon-Eshbach surface modes do not exist. The chirality is suppressed when theinterlayer exchange coupling becomes strong.

Chiral excitation of spin waves in ferromagnetic films