Journal
PHYSICAL REVIEW B
Volume 103, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.014412
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [TRR 227]
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This study evaluates the magnetic-field dependence of the spin Seebeck effect in a ferromagnetic insulator at low temperatures using a simplified microscopic model. The research shows that singular features observed at low temperatures are independent of the relative strength of magnon and phonon scattering.
Using a simplified microscopic model of coupled spin and lattice excitations in a ferromagnetic insulator we evaluate the magnetic-field dependence of the spin Seebeck effect at low temperatures. The model includes Heisenberg exchange coupling, a harmonic lattice potential, and a pseudodipolar exchange interaction. Our approach goes beyond previous work [Phys. Rev. B 98, 134421 (2018)] in that it does not rely on the a priori assumption of a fast equilibration of the magnon and phonon distributions. Our theory shows that singular features in the magnetic-field dependence of the spin Seebeck effect at low temperatures observed by Kikkawa et al. [Phys. Rev. Lett. 117, 207203 (2016)] are independent of the relative strength of magnon-impurity and phonon-impurity scattering.
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