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

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5]
  1. Univ. de Liège (Belgium); 1nanomat/Q-MAT/CESAM and European Theoretical Spectroscopy Facility, Université de Liège, B-4000 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)
  5. Univ. de Liège (Belgium)

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.

Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0016176
OSTI ID:
1594876
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 21 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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