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Mohseni M, Wang Q, Heinz B, et al. Controlling the Nonlinear Relaxation of Quantized Propagating Magnons in Nanodevices. Phys Rev Lett. 2021;126(9):097202doi: 10.1103/PhysRevLett.126.097202.
Mohseni, M., Wang, Q., Heinz, B., Kewenig, M., Schneider, M., Kohl, F., Lägel, B., Dubs, C., Chumak, A. V., & Pirro, P. (2021). Controlling the Nonlinear Relaxation of Quantized Propagating Magnons in Nanodevices. Physical review letters, 126(9), 097202. https://doi.org/10.1103/PhysRevLett.126.097202
Mohseni, M, et al. "Controlling the Nonlinear Relaxation of Quantized Propagating Magnons in Nanodevices." Physical review letters vol. 126,9 (2021): 097202. doi: https://doi.org/10.1103/PhysRevLett.126.097202
Mohseni M, Wang Q, Heinz B, Kewenig M, Schneider M, Kohl F, Lägel B, Dubs C, Chumak AV, Pirro P. Controlling the Nonlinear Relaxation of Quantized Propagating Magnons in Nanodevices. Phys Rev Lett. 2021 Mar 05;126(9):097202. doi: 10.1103/PhysRevLett.126.097202. PMID: 33750157.
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Phys Rev Lett. 2021 Mar 05;126(9):097202. doi: 10.1103/PhysRevLett.126.097202.

Controlling the Nonlinear Relaxation of Quantized Propagating Magnons in Nanodevices.

Physical review letters

M Mohseni, Q Wang, B Heinz, M Kewenig, M Schneider, F Kohl, B Lägel, C Dubs, A V Chumak, P Pirro

Affiliations

  1. Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
  2. Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria.
  3. Graduate School Materials Science in Mainz, Staudingerweg 9, 55128 Mainz, Germany.
  4. Nano Structuring Center, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
  5. INNOVENT e.V., Technologieentwicklung, Prüssingstraße 27B, 07745 Jena, Germany.

PMID: 33750157 DOI: 10.1103/PhysRevLett.126.097202

Abstract

Relaxation of linear magnetization dynamics is well described by the viscous Gilbert damping processes. However, for strong excitations, nonlinear damping processes such as the decay via magnon-magnon interactions emerge and trigger additional relaxation channels. Here, we use space- and time-resolved microfocused Brillouin light scattering spectroscopy and micromagnetic simulations to investigate the nonlinear relaxation of strongly driven propagating spin waves in yttrium iron garnet nanoconduits. We show that the nonlinear magnon relaxation in this highly quantized system possesses intermodal features, i.e., magnons scatter to higher-order quantized modes through a cascade of scattering events. We further show how to control such intermodal dissipation processes by quantization of the magnon band in single-mode devices, where this phenomenon approaches its fundamental limit. Our study extends the knowledge about nonlinear propagating spin waves in nanostructures which is essential for the construction of advanced spin-wave elements as well as the realization of Bose-Einstein condensates in scaled systems.

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