Spin Pinning and Spin-Wave Dispersion in Nanoscopic Ferromagnetic Waveguides

Q. Wang, B. Heinz, R. Verba, M. Kewenig, P. Pirro, M. Schneider, T. Meyer, B. Lägel, C. Dubs, T. Brächer, and A. V. Chumak
Phys. Rev. Lett. 122, 247202 – Published 19 June 2019
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Abstract

Spin waves are investigated in yttrium iron garnet waveguides with a thickness of 39 nm and widths ranging down to 50 nm, i.e., with an aspect ratio thickness over width approaching unity, using Brillouin light scattering spectroscopy. The experimental results are verified by a semianalytical theory and micromagnetic simulations. A critical width is found, below which the exchange interaction suppresses the dipolar pinning phenomenon. This changes the quantization criterion for the spin-wave eigenmodes and results in a pronounced modification of the spin-wave characteristics. The presented semianalytical theory allows for the calculation of spin-wave mode profiles and dispersion relations in nanostructures.

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  • Received 9 July 2018
  • Revised 5 March 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.247202

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Q. Wang1,*, B. Heinz1,2,*, R. Verba3, M. Kewenig1, P. Pirro1, M. Schneider1, T. Meyer1,4, B. Lägel5, C. Dubs6, T. Brächer1, and A. V. Chumak1,†

  • 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
  • 2Graduate School Materials Science in Mainz, Staudingerweg 9, 55128 Mainz, Germany
  • 3Institute of Magnetism, Kyiv 03680, Ukraine
  • 4THATec Innovation GmbH, Augustaanlage 23, 68165 Mannheim, Germany
  • 5Nano Structuring Center, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
  • 6INNOVENT e.V., Technologieentwicklung, Prüssingstraße 27B, 07745 Jena, Germany

  • *These authors have contributed equally to this work.
  • Corresponding author. chumak@physik.uni-kl.de

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Issue

Vol. 122, Iss. 24 — 21 June 2019

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