Fast switchable unidirectional magnon emitter

TL;DR

This paper demonstrates a fast, switchable unidirectional magnon emitter using current-induced asymmetric fields in the forward volume spin wave mode, enabling rapid control of magnon propagation for high-speed spintronic applications.

Contribution

It introduces a novel method to achieve fast, switchable unidirectional magnon emission in the forward volume mode, overcoming limitations of previous Damon-Eshbach mode-based approaches.

Findings

Significant nonreciprocity observed in magnon emission.

Nanosecond switchability achieved via current-induced fields.

Potential for high-speed, low-power magnonic circuits.

Abstract

Magnon spintronics is an emerging field that explores the use of magnons, the quanta of spin waves in magnetic materials for information processing and communication. Achieving unidirectional information transport with fast switching capability is critical for the development of fast integrated magnonic circuits, which offer significant advantages in high-speed, low-power information processing. However, previous unidirectional information transport has primarily focused on Damon-Eshbach spin wave modes, which are non-switchable as their propagation direction is defined by the direction of the external field and cannot be changed in a short time. Here, we experimentally demonstrate a fast switchable unidirectional magnon emitter in the forward volume spin wave mode by a current-induced asymmetric Oersted field. Our findings reveal significant nonreciprocity and nanosecond switchability, underscoring the potential of the method to advance high-speed spin-wave processing networks.