Spin wave diffraction model for perpendicularly magnetized films

TL;DR

This paper introduces a diffraction model for spin waves in perpendicularly magnetized films, enabling accurate predictions of diffraction patterns for various excitation geometries, useful for designing magnonic devices.

Contribution

The authors develop a near-field diffraction model based on Kalinikos-Slavin formalism that accurately predicts spin wave diffraction patterns in perpendicular films, validated against simulations.

Findings

Excellent agreement with MuMax3 simulations.

Model applicable to any excitation geometry.

Useful for designing magnon beamforming devices.

Abstract

We present a near-field diffraction model for spin waves in perpendicularly magnetized films applicable in any geometries of excitation fields. This model relies on Kalinikos-Slavin formalism to express the dynamic susceptibility tensor in k-space, and calculate the diffraction patterns via inverse 2D-Fourier transform of the response functions. We show an excellent quantitative agreement between our model and MuMax3 micro-magnetic simulations on two different geometries of antennas. Our method benchmarks spin wave diffraction in perpendicularly magnetized films, and is readily applicable for future designs of magnon beamforming and interferometric devices.