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Flat bands, indirect gaps, and unconventional spin-wave behavior induced by a periodic Dzyaloshinskii-Moriya interaction

Flat bands, indirect gaps, and unconventional spin-wave behavior induced by a periodic Dzyaloshinskii-Moriya interaction
Flat bands, indirect gaps, and unconventional spin-wave behavior induced by a periodic Dzyaloshinskii-Moriya interaction
Periodically patterned metamaterials are known for exhibiting wave properties similar to the ones observed in electronic band structures in crystal lattices. In particular, periodic ferromagnetic materials are characterized by the presence of bands and band gaps in their spin-wave spectrum at tunable GHz frequencies. Recently, the fabrication of magnets hosting Dzyaloshinskii-Moriya interactions has been pursued with high interest since properties, such as the stabilization of chiral spin textures and nonreciprocal spin-wave propagation, emerge from this antisymmetric exchange coupling. In this context, to further engineer the magnon band structure, we propose the implementation of magnonic crystals with periodic Dzyaloshinskii-Moriya interactions, which can be obtained, for instance, via patterning of periodic arrays of heavy metal wires on top of an ultrathin magnetic film. We demonstrate through theoretical calculations and micromagnetic simulations that such systems show an unusual evolution of the standing spin waves around the gaps. We also predict the emergence of indirect gaps and flat bands, effects that depend on the strength of the Dzyaloshinskii-Moriya interaction. Such phenomena, which have been previously observed in different systems, are observed here simultaneously, opening new routes towards engineered metamaterials for spin-wave-based devices.
magnetism, magnonics, magnons, dzyaloshinskii-moriya, ultrathin films, micromagnetics
0031-9007
Gallardo, R.A.
29fbbcea-beaf-48c8-a565-5fbe74bb32e4
Cortés-Ortuño, D.
97d026d6-1083-4edf-8ba6-2f66a3e15033
Schneider, T.
048f7341-d755-4db3-a8d8-eeeaba9ae91f
Roldán-Molina, A.
70d7a981-4cca-4773-83d1-f49792d4aaeb
Ma, Fusheng
5c389f14-8983-4f18-803d-7acb21398307
Troncoso, R. E.
e19de9bc-a321-4062-8cfe-42d778161a88
Lenz, K.
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Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Lindner, J.
abd4e18f-8230-4969-bce5-ab201a2a4b7f
Landeros, P.
ade05e37-18cf-4752-b729-0d32f9244ca1
Gallardo, R.A.
29fbbcea-beaf-48c8-a565-5fbe74bb32e4
Cortés-Ortuño, D.
97d026d6-1083-4edf-8ba6-2f66a3e15033
Schneider, T.
048f7341-d755-4db3-a8d8-eeeaba9ae91f
Roldán-Molina, A.
70d7a981-4cca-4773-83d1-f49792d4aaeb
Ma, Fusheng
5c389f14-8983-4f18-803d-7acb21398307
Troncoso, R. E.
e19de9bc-a321-4062-8cfe-42d778161a88
Lenz, K.
8d3057fb-2232-45f0-889c-c1c7678b75f5
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Lindner, J.
abd4e18f-8230-4969-bce5-ab201a2a4b7f
Landeros, P.
ade05e37-18cf-4752-b729-0d32f9244ca1

Gallardo, R.A., Cortés-Ortuño, D., Schneider, T., Roldán-Molina, A., Ma, Fusheng, Troncoso, R. E., Lenz, K., Fangohr, H., Lindner, J. and Landeros, P. (2019) Flat bands, indirect gaps, and unconventional spin-wave behavior induced by a periodic Dzyaloshinskii-Moriya interaction. Physical Review Letters, 122 (067204). (doi:10.1103/PhysRevLett.122.067204).

Record type: Article

Abstract

Periodically patterned metamaterials are known for exhibiting wave properties similar to the ones observed in electronic band structures in crystal lattices. In particular, periodic ferromagnetic materials are characterized by the presence of bands and band gaps in their spin-wave spectrum at tunable GHz frequencies. Recently, the fabrication of magnets hosting Dzyaloshinskii-Moriya interactions has been pursued with high interest since properties, such as the stabilization of chiral spin textures and nonreciprocal spin-wave propagation, emerge from this antisymmetric exchange coupling. In this context, to further engineer the magnon band structure, we propose the implementation of magnonic crystals with periodic Dzyaloshinskii-Moriya interactions, which can be obtained, for instance, via patterning of periodic arrays of heavy metal wires on top of an ultrathin magnetic film. We demonstrate through theoretical calculations and micromagnetic simulations that such systems show an unusual evolution of the standing spin waves around the gaps. We also predict the emergence of indirect gaps and flat bands, effects that depend on the strength of the Dzyaloshinskii-Moriya interaction. Such phenomena, which have been previously observed in different systems, are observed here simultaneously, opening new routes towards engineered metamaterials for spin-wave-based devices.

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More information

Published date: 13 February 2019
Keywords: magnetism, magnonics, magnons, dzyaloshinskii-moriya, ultrathin films, micromagnetics

Identifiers

Local EPrints ID: 430959
URI: https://eprints.soton.ac.uk/id/eprint/430959
ISSN: 0031-9007
PURE UUID: 0aafb604-af4e-427e-b087-301ef71b48b4
ORCID for D. Cortés-Ortuño: ORCID iD orcid.org/0000-0003-3799-3141

Catalogue record

Date deposited: 17 May 2019 16:30
Last modified: 10 Sep 2019 00:24

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Contributors

Author: R.A. Gallardo
Author: D. Cortés-Ortuño ORCID iD
Author: T. Schneider
Author: A. Roldán-Molina
Author: Fusheng Ma
Author: R. E. Troncoso
Author: K. Lenz
Author: H. Fangohr
Author: J. Lindner
Author: P. Landeros

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