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Condensed Matter > Mesoscale and Nanoscale Physics

arXiv:2404.14314 (cond-mat)
[Submitted on 22 Apr 2024]

Title:Multipole magnons in topological skyrmion lattices resolved by cryogenic Brillouin light scattering microscopy

Authors:Ping Che, Riccardo Ciola, Markus Garst, Volodymyr Kravchuk, Priya R. Baral, Arnaud Magrez, Helmuth Berger, Thomas Schönenberger, Henrik M. Rønnow, Dirk Grundler
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Abstract:Non-collinear magnetic skyrmion lattices provide novel magnonic functionalities due to their topological magnon bands and asymmetric dispersion relations. Magnon excitations with intermediate wavelengths comparable to inter-skyrmion distances are particularly interesting but largely unexplored so far due to experimental challenges. Here, we report the detection of such magnons with wavevectors q $\simeq$ 48 rad/um in the metastable skyrmion lattice phase of the bulk chiral magnet Cu$_2$OSeO$_3$ using micro-focused Brillouin light scattering microscopy. Thanks to its high sensitivity and broad bandwidth we resolved various excitation modes of a single skyrmion lattice domain over a wide magnetic field regime. Besides the known modes with dipole character, quantitative comparison of frequencies and spectral weights to theoretical predictions enabled the identification of a quadrupole mode and observation of signatures which we attribute to a decupole and a sextupole mode. Our combined experimental and theoretical work highlights that skyrmionic phases allow for the design of magnonic devices exploiting topological magnon bands.
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:2404.14314 [cond-mat.mes-hall]
  (or arXiv:2404.14314v1 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.2404.14314

Submission history

From: Ping Che [view email]
[v1] Mon, 22 Apr 2024 16:21:38 UTC (3,271 KB)
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