Probing Spin Wave Diffraction Patterns of Curved Antennas

TL;DR

This paper investigates how curved antenna shapes influence spin wave diffraction patterns in thin films, demonstrating a method to shape and probe magnon interference with high spatial resolution.

Contribution

It introduces a novel methodology for shaping spin wave beams using curved antennas and demonstrates its application in a spin wave Young's interference experiment.

Findings

Spin wave diffraction patterns depend on antenna curvature.

Interference patterns can be probed with 1μm² resolution.

The methodology enables controlled magnon interference experiments.

Abstract

We report on the dependence of curvilinear shaped coplanar waveguides on the near-field diffraction patterns of spin waves propagating in perpendicularly magnetized thin films. Implementing the propagating spin waves spectroscopy techniques on either concentrically or eccentrically shaped antennas, we show how the link budget is directly affected by the spin wave interference, in good agreement with near-field diffraction simulations. This work demonstrates the feasibility to inductively probe a magnon interference pattern with a resolution down to 1$\mu$m$^2$, and provides a methodology for shaping spin wave beams from an antenna design. This methodology is successfully implemented in the case study of a spin wave Young's interference experiment.