Breaking space inversion-symmetry to obtain asymmetric spin-wave excitation in systems with nonuniform magnetic exchange

Macêdo, R. , Kudinoor, A. S., Livesey, K. L. and Camley, R. E. (2021) Breaking space inversion-symmetry to obtain asymmetric spin-wave excitation in systems with nonuniform magnetic exchange. Advanced Electronic Materials, (doi: 10.1002/aelm.202100435) (Early Online Publication)

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Abstract

The consequences of non-uniform exchange in magnetic systems are reported. The quantum mechanical exchange interaction between spins is responsible for the phenomenon of magnetic order, and is generally considered to be uniform across bulk magnetic systems. Partly inspired by the Dzyaloshinskii-Moriya interaction—also known as antisymmetric exchange—a linearly varying exchange interaction is used along a magnetic strip as a route to spatial inversion symmetry-breaking. It is found that, in addition to asymmetric modes and localization, spatially varying exchange can be used to design nonreciprocal magnetic signal excitation at frequencies that are tunable. Moreover, the authors’ work predicts nonreciprocity to occur across a vast range of frequencies up to hundreds of GHz. Such spin wave engineering is a key area of ongoing research in the fields of magnonics and spintronics, which are expected to enable the next generation of wireless communication technology and information processing. Analogous nonreciprocity is expected to occur in other wave systems with gradient properties.

Item Type:Articles
Additional Information:R. Macedo acknowledges support from the Leverhulme Trust and the University of Glasgow through LKAS funds.
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Macedo, Dr Rair
Authors: Macêdo, R., Kudinoor, A. S., Livesey, K. L., and Camley, R. E.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Advanced Electronic Materials
Publisher:Wiley
ISSN:2199-160X
ISSN (Online):2199-160X
Published Online:12 September 2021
Copyright Holders:Copyright © 2021 Wiley-VCH GmbH
First Published:First published in Advanced Electronic Materials 2021
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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