Narrow magnonic waveguides based on domain walls

Garcia-Sanchez, F., Borys, P., Soucaille, R., Adam, J.-P., Stamps, R. L. and Kim, J.-V. (2015) Narrow magnonic waveguides based on domain walls. Physical Review Letters, 114(24), 247206. (doi: 10.1103/PhysRevLett.114.247206) (PMID:26197006)

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The channeling of spin waves with domain walls in ultrathin ferromagnetic films is demonstrated theoretically and through micromagnetics simulations. It is shown that propagating excitations localized to the wall, which appear in the frequency gap of bulk spin wave modes, can be guided in curved geometries and propagate in close proximity to other channels. For Néel-type walls arising from a Dzyaloshinskii-Moriya interaction, the channeling is strongly nonreciprocal and group velocities can exceed 1  km/s in the long wavelength limit for certain propagation directions. The channeled modes represent an unusual analogy of whispering gallery waves that are one dimensional and nonreciprocal with this interaction. Moreover, a sufficiently strong Dzyaloshinskii-Moriya interaction can create a degeneracy of channeled and propagating modes at a critical wave vector.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Stamps, Professor Robert
Authors: Garcia-Sanchez, F., Borys, P., Soucaille, R., Adam, J.-P., Stamps, R. L., and Kim, J.-V.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Copyright Holders:Copyright © 2015 American Physical Society
First Published:First published in Physical Review Letters 114(24):247206
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5525/gla.researchdata.170

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
683531Consortium for advanced materials based on spin chiralityRobert StampsEngineering & Physical Sciences Research Council (EPSRC)EP/M024423/1S&E P&A - PHYSICS & ASTRONOMY