Advanced magnon-optic effects with spin-wave leaky modes

TL;DR

This paper demonstrates the excitation and control of leaky spin waves in ferromagnetic structures, revealing phenomena like the magnonic Woods anomaly and enabling potential applications in magnonic routing.

Contribution

It introduces a novel method for exciting leaky spin waves and controlling their reflection and transfer into guided modes for magnonic devices.

Findings

Leaky spin waves can be excited along ferromagnetic stripes.

Resonance effects lead to the magnonic Woods anomaly.

Significant Goos-Hanchen shift enhancement observed.

Abstract

We numerically demonstrate the excitation of leaky spin waves (SWs) guided along a ferromagnetic stripe by an obliquely incident SW beam on the thin film edge placed below the stripe. During propagation, leaky waves emit energy back to the layer in the form of plane waves and several laterally shifted parallel SW beams. This resonance excitation, combined with interference effects of the reflected and re-emitted waves, results in the magnonic Woods anomaly and significant increase of the Goos-Hanchen shift magnitude. Hence, we provide a unique platform to control SW reflection and to transfer SWs from a 2D platform into the 1D guiding mode that can be used to form a transdimensional magnonic router.