Non-local magnon transport in a magnetic domain wall wave guide

TL;DR

This paper develops a theoretical framework for non-local magnon transport through magnetic domain wall waveguides in ferromagnetic insulators, enabling reconfigurable magnonic devices via electrically injected and detected spin signals.

Contribution

It introduces a novel theory for non-local magnon transport in domain wall waveguides with a specific degeneracy requirement, expanding the understanding of magnonic spin transport.

Findings

Non-local magnon transport can be achieved through domain walls in ferromagnetic insulators.

Electrical injection and detection of magnons are possible via spin-flip scattering and the spin-Hall effect.

The system's topological protection ensures robust magnonic signal transmission.

Abstract

Magnetic domain walls function as a wave guide for low energy magnons. In this paper we develop the theory for the non-local transport of these bound magnons through a ferromagnetic insulator that are injected and detected electrically in adjacent normal metal leads by spin-flip scatting processes and the (inverse) spin-Hall effect. Our set-up requires a twofold degeneracy of the magnetic ground state, which we realize by an easy axis and hard axis anisotropy, in the ferromagnetic insulator. This is readily provided by a broad range of materials. The domain wall is a a topologically protected feature of the system and we obtain the non-local spin transport through it. Thereby we provide a framework for reconfigureable magnonic devices.