Finite-temperature interatomic exchange and magnon softening in Fe overlayers on Ir(001)

D. C. M. Rodrigues, A. Szilva, A. B. Klautau, A. Bergman, O. Eriksson, and C. Etz

Phys. Rev. B 94, 014413 – Published 11 July 2016

Abstract

We evaluate how thermal effects soften the magnon dispersion in 6 layers of Fe(001) on top of Ir(001). We perform a systematic study considering noncollinear spin arrangement and calculate configuration-dependent exchange parameters $J_{i j}^{n c}$ following the methodology described by Szilva et al. [Phys. Rev. Lett. 111, 127204 (2013)]. In addition, Monte Carlo simulations were performed in order to estimate the noncollinear spin arrangement as a function of temperature. Hence the $J_{i j}^{n c}$ 's related to these configurations were calculated and used in an atomistic spin dynamics approach to evaluate the magnon spectra. Our results show good agreement with recent room-temperature measurements, and highlights how thermal effects produce magnon softening in this, and similar, systems.

Received 30 April 2016
Revised 15 June 2016

DOI:https://doi.org/10.1103/PhysRevB.94.014413

Physics Subject Headings (PhySH)

Magnons

Monte Carlo methods Noncommutative geometry

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

D. C. M. Rodrigues^1,2, A. Szilva², A. B. Klautau¹, A. Bergman², O. Eriksson², and C. Etz^2,3

¹Faculdade de Física, Universidade Federal do Pará, Belém, Pará, Brazil
²Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
³Department of Engineering Sciences and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden

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Vol. 94, Iss. 1 — 1 July 2016

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