Orbital effects in magnetic dynamics of thulium iron garnets

A. Lehmann-Szweykowska, P. E. Wigen, L. Kowalewski, M. M. Kaczmarek, and T. B. Mitchell
Phys. Rev. B 37, 459 – Published 1 January 1988
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Abstract

A microscopic approach has been developed for studying the magnetic dynamics of thulium iron garnet (TmlG) based on Mori’s general method of dynamical relaxation functions. The transverse magnetic excitation spectrum is analyzed. Calculating the static correlations in the mean-field approximation, the temperature dependence of both the magnetic excitations and their effective g factors are obtained. The latter displays qualitative and even quantitative agreement with the results of ferromagnetic resonance in TmlG. The emphasis is put on the crystal-field effects which essentially influence the behavior of the effective g factor. The linewidth of the resonance mode is also calculated assuming that the broadening results from the interaction of Tm3+ with the crystal lattice.

  • Received 27 January 1987

DOI:https://doi.org/10.1103/PhysRevB.37.459

©1988 American Physical Society

Authors & Affiliations

A. Lehmann-Szweykowska

  • Solid State Theory Division, Institute of Physics, A. Mickiewicz University, Poznán, Poland

P. E. Wigen

  • Department of Physics, The Ohio State University, Columbus, Ohio 43210

L. Kowalewski and M. M. Kaczmarek

  • Solid State Theory Division, Institute of Physics, A. Mickiewicz University, Poznán, Poland

T. B. Mitchell

  • Department of Physics, The Ohio State University, Columbus, Ohio 43210

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Vol. 37, Iss. 1 — 1 January 1988

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