Curvilinear manipulation of polarized spin wave

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.