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MA: Fachverband Magnetismus
MA 61: Caloric Effects
MA 61.7: Vortrag
Freitag, 20. März 2020, 11:00–11:15, HSZ 101
Magnonic Analogue of Edelstein Effect in Antiferromagnetic Insulators — Bo Li1, •Alexander Mook2, Aldo Raeliarijaona1, and Alexey Kovalev1 — 1Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA — 2Department of Physics, University of Basel, CH-4056 Basel
The electronic Edelstein or inverse spin-galvanic effect comprises a nonequilibrium spin density as response to a charge current [1]. Herein [2], we investigate the nonequilibrium spin polarization due to a temperature gradient in antiferromagnetic insulators, which is the magnonic analogue of the Edelstein effect.
We derive a linear response theory of a temperature-gradient-induced spin polarization in collinear and noncollinear antiferromagnets and present selected examples in one, two, and three dimensions. Assuming a realistic temperature gradient of 10 K/mm, we find two-dimensional spin densities of up to ∼ 106 ℏ/cm2 [e.g., in the noncollinear kagome antiferromagnet KFe3(OH)6(SO4)2] and three-dimensional bulk spin densities of up to ∼ 1014 ℏ/cm3, encouraging an experimental detection.
[1] A. Aronov and Y. B. Lyanda-Geller, JETP Lett. 50, 431 (1989); V. Edelstein, Solid State Commun. 73, 233 (1990); [2] B. Li, A. Mook, A. Raeliarijaona, A. Kovalev, preprint arXiv:1910.00143