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Title: Competition of lattice and spin excitations in the temperature dependence of spin-wave properties

Abstract

The interplay of magnons and phonons can induce strong temperature variations in the magnetic exchange interactions, leading to changes in the magnetothermal response. This is a central mechanism in many magnetic phenomena, and in the new field of Spin Caloritronics, which focuses on the combination of heat and spin currents. Boson model systems have previously been developed to describe the magnon-phonon coupling but, until recently, studies rely on empirical parameters. In this paper, we propose a first-principles approach to describe the dependence of the magnetic exchange integrals on phonon renormalization, leading to changes in the magnon dispersion as a function of temperature. The temperature enters into the spin dynamics (by introducing fluctuations) as well as in the magnetic exchange itself. Depending on the strength of the coupling, these two temperatures may or may not be equilibrated, yielding different regimes. We test our approach in typical and well-known ferromagnetic materials: Ni, Fe, and Permalloy. Finally, we compare our results to recent experiments on the spin-wave stiffness, and discuss departures from Bloch’s law and parabolic dispersion.

Authors:
 [1];  [2];  [3];  [4];  [1]
  1. Univ. de Liège (Belgium)
  2. Unidad Querétaro (Mexico)
  3. Univ. de Liège (Belgium); Sheffield Hallam Univ. (United Kingdom)
  4. West Virginia Univ., Morgantown, WV (United States); Benemérita Univ. Autnoma de Puebla (Mexico)
Publication Date:
Research Org.:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1594876
Grant/Contract Number:  
SC0016176; TheMoTherm 10/15-03; AIMED 15/19-09; 1.E051.12; 1434897; SI2-SSE1740111; RI-283493; RI-342763; 653838; OCI-1053575
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Di Gennaro, Marco, Miranda, Alonso L., Ostler, Thomas A., Romero, Aldo H., and Verstraete, Matthieu J. Competition of lattice and spin excitations in the temperature dependence of spin-wave properties. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.214417.
Di Gennaro, Marco, Miranda, Alonso L., Ostler, Thomas A., Romero, Aldo H., & Verstraete, Matthieu J. Competition of lattice and spin excitations in the temperature dependence of spin-wave properties. United States. doi:10.1103/PhysRevB.97.214417.
Di Gennaro, Marco, Miranda, Alonso L., Ostler, Thomas A., Romero, Aldo H., and Verstraete, Matthieu J. Thu . "Competition of lattice and spin excitations in the temperature dependence of spin-wave properties". United States. doi:10.1103/PhysRevB.97.214417. https://www.osti.gov/servlets/purl/1594876.
@article{osti_1594876,
title = {Competition of lattice and spin excitations in the temperature dependence of spin-wave properties},
author = {Di Gennaro, Marco and Miranda, Alonso L. and Ostler, Thomas A. and Romero, Aldo H. and Verstraete, Matthieu J.},
abstractNote = {The interplay of magnons and phonons can induce strong temperature variations in the magnetic exchange interactions, leading to changes in the magnetothermal response. This is a central mechanism in many magnetic phenomena, and in the new field of Spin Caloritronics, which focuses on the combination of heat and spin currents. Boson model systems have previously been developed to describe the magnon-phonon coupling but, until recently, studies rely on empirical parameters. In this paper, we propose a first-principles approach to describe the dependence of the magnetic exchange integrals on phonon renormalization, leading to changes in the magnon dispersion as a function of temperature. The temperature enters into the spin dynamics (by introducing fluctuations) as well as in the magnetic exchange itself. Depending on the strength of the coupling, these two temperatures may or may not be equilibrated, yielding different regimes. We test our approach in typical and well-known ferromagnetic materials: Ni, Fe, and Permalloy. Finally, we compare our results to recent experiments on the spin-wave stiffness, and discuss departures from Bloch’s law and parabolic dispersion.},
doi = {10.1103/PhysRevB.97.214417},
journal = {Physical Review B},
number = 21,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}

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