Curvilinear manipulation of polarized spin wave

TL;DR

This paper demonstrates how curvature and torsion in curved antiferromagnetic wires can control polarized spin waves, enabling new magnonic device functionalities through geometric effects like the Berry phase.

Contribution

It introduces a novel approach to manipulate polarized spin waves using the geometry of magnetic wires, linking curvilinear effects to spin wave polarization control.

Findings

Polarized spin waves can be controlled by wire curvature and torsion.

Curvilinear effects induce Berry phase in spin wave evolution.

Potential for designing polarization-based magnonic devices.

Abstract

Polarization, the precession direction with respect to the background magnetization, is an intrinsic degree of freedom of spin wave. Introducing symmetry breaking mechanisms lies in the heart of lifting the degeneracy between polarized spin wave modes, and is essential in constructing polarization-based magnonic devices. Here we show that polarized spin waves can be naturally harnessed in a curved antiferromagnetic wire via tuning its curvature and torsion. Specifically, we investigate evolution of polarized spin wave in a spin wave rotator and a spin wave interferometer based on magnetic circular helices, and correlate these curvilinear effects to the Berry phase accumulated along wires.