Nutation spin waves in ferromagnets

Sergei V. Titov, William J. Dowling, Yuri P. Kalmykov, and Mikhail Cherkasskii
Phys. Rev. B 105, 214414 – Published 10 June 2022

Abstract

Magnetization dynamics and spin waves in ferromagnets are investigated using the inertial Landau-Lifshitz-Gilbert equation. Taking inertial magnetization dynamics into account, dispersion relations describing the propagation of nutation spin waves in an arbitrary direction relative to the applied magnetic field are derived via Maxwell's equations. It is found that the inertia of magnetization causes the hybridization of electromagnetic waves and nutation spin waves in ferromagnets, hybrid nutation spin waves emerge, and the redshift of frequencies of precession spin waves is initiated, which transforms to precession-nutation spin waves. These effects depend sharply on the direction of wave propagation relative to the applied magnetic field. Moreover, the waves propagating parallel to the applied field are circularly polarized, while the waves propagating perpendicular to that field are elliptically polarized. The characteristics of these spin nutation waves are also analyzed.

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  • Received 24 December 2021
  • Revised 14 March 2022
  • Accepted 26 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.214414

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sergei V. Titov1, William J. Dowling2, Yuri P. Kalmykov3, and Mikhail Cherkasskii4,*

  • 1Kotel'nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Vvedenskii Square 1, Fryazino, Moscow Region, 141190, Russia
  • 2Department of Electronic and Electrical Engineering, Trinity College Dublin, Dublin 2, Ireland
  • 3Laboratoire de Modélisation Pluridisciplinaire et Applications, Université de Perpignan Via Domitia, F-66860, Perpignan, France
  • 4Faculty of Physics, University of Duisburg-Essen, Duisburg, 47057, Germany

  • *macherkasskii@hotmail.com

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Issue

Vol. 105, Iss. 21 — 1 June 2022

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