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MA: Fachverband Magnetismus
MA 45: Spin Structures and Magnetic Phase Transitions II
MA 45.1: Talk
Thursday, March 21, 2024, 15:00–15:15, EB 407
Modelling thermal transport in spiral magnets — •Margherita Parodi1,2 and Sergey Artyukhin1 — 1Italian Institute of Technology, Genova, Italy — 2University of Genova, Italy
Magnetic memory and logic devices, including prospective ones based on skyrmions, inevitably produce heat. Thus, controlling heat flow is essential for their performance. Here we study magnon contribution to thermal conductivity in the most basic non-collinear magnet with a spin spiral ground state. Non-collinearity leads to anharmonic terms, resulting in magnon fusion and decay processes. These processes determine the magnon lifetime which can be used to estimate thermal conductivity in single mode approximation. However, by solving the full Boltzmann equation numerically, we find much higher thermal conductivity. This signifies that heat is carried not by individual magnons but by their linear combinations, called relaxons. The thermal conductivity is found to be increasing with the diminishing twist angle, consistent with recent experiments. The results pave the path to understanding magnetic thermal transport in other non-collinear magnets.
Keywords: thermal conductivity; spin spirals; magnons