Unidirectional magnetic coupling

TL;DR

This paper demonstrates that interlayer Dzyaloshinskii-Moriya interaction combined with non-local Gilbert damping induces unidirectional magnetic coupling, enabling potential spintronic diode applications and advancing device design through reservoir engineering.

Contribution

It introduces a novel mechanism for unidirectional magnetic coupling using interlayer Dzyaloshinskii-Moriya interaction and non-local damping, with implications for spin-current control.

Findings

Unidirectional magnetic coupling arises from the combined effects of Dzyaloshinskii-Moriya interaction and non-local damping.

The coupling affects magnetic susceptibility and enables unidirectional spin-wave propagation.

Potential applications include spin-current and spin-wave diodes.

Abstract

We show that interlayer Dzyaloshinskii-Moriya interaction in combination with non-local Gilbert damping gives rise to unidirectional magnetic coupling. That is, the coupling between two magnetic layers -- say the left and right layer -- is such that dynamics of the left layer leads to dynamics of the right layer, but not vice versa. We discuss the implications of this result for the magnetic susceptibility of a magnetic bilayer, electrically-actuated spin-current transmission, and unidirectional spin-wave packet generation and propagation. Our results may enable a route towards spin-current and spin-wave diodes and further pave the way to design spintronic devices via reservoir engineering.