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Dispersion relation of nutation surface spin waves in ferromagnets

Mikhail Cherkasskii, Michael Farle, and Anna Semisalova
Phys. Rev. B 103, 174435 – Published 28 May 2021
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Abstract

Inertia effects in magnetization dynamics are theoretically shown to result in a different type of spin waves, i.e., nutation surface spin waves, which propagate at terahertz frequencies in in-plane magnetized ferromagnetic thin films. Considering the magnetostatic limit, i.e., neglecting exchange coupling, we calculate dispersion relation and group velocity, which we find to be slower than the velocity of conventional (precession) spin waves. In addition, we find that the nutation surface spin waves are backward spin waves. Furthermore, we show that inertia causes a decrease of the frequency of the precession spin waves, namely magnetostatic surface spin waves and backward volume magnetostatic spin waves. The magnitude of the decrease depends on the magnetic properties of the film and its geometry.

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  • Received 17 March 2021
  • Accepted 4 May 2021

DOI:https://doi.org/10.1103/PhysRevB.103.174435

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mikhail Cherkasskii1,*, Michael Farle2,3, and Anna Semisalova2

  • 1Department of General Physics 1, St. Petersburg State University, St. Petersburg 199034, Russia
  • 2Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg 47057, Germany
  • 3Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

  • *Corresponding author: macherkasskii@hotmail.com

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Vol. 103, Iss. 17 — 1 May 2021

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