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MA: Fachverband Magnetismus

MA 61: Caloric Effects

MA 61.6: Vortrag

Freitag, 20. März 2020, 10:45–11:00, HSZ 101

Orbital Nernst Effect of Magnons — •Li-chuan Zhang^1,2, Fabian R. Lux^1,2, Jan-Philipp Hanke¹, Patrick M. Buhl³, Sergii Grytsiuk¹, Stefan Blügel¹, and Yuriy Mokrousov^1,3 — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — ²Department of Physics, RWTH Aachen University, 52056 Aachen, Germany — ³Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

In the past, magnons have proven to mediate thermal transport of spin in various systems (see references in e.g. [1]). We will reveal that the fundamental coupling of the scalar spin chirality, inherent to magnons, to the electronic degrees of freedom in the system can result in the generation of sizeable orbital magnetization and thermal transport of orbital angular momentum. We will demonstrate the emergence of the latter phenomenon of the orbital Nernst effect by referring to the spin-wave Hamiltonian of Kagome ferromagnets and predict that in a wide range of systems the transverse current of orbital angular momentum carried by magnons in response to an applied temperature gradient can overshadow the accompanying spin current [2]. We suggest that the discovered effect fundamentally correlates with the topological Hall effect of fluctuating magnets, and suggest that it can be utilized in magnonic devices for generating magnonic orbital torques. We acknowledge funding from DFG through SPP 2137 "Skyrmionics", DARPA TEE Program and CSC (No. [2016]3100). [1] L.Zhang et al., arXiv:1901.06192 (2019); [2] L.Zhang et al., arXiv:1910.03317 (2019)