Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetic Semiconductors, Magnetization Dynamics and Damping
MA 43.7: Vortrag
Donnerstag, 21. März 2024, 16:45–17:00, EB 202
Lattice damping: a first attempt from tight-binding — •Zhiwei Lu1, Ivan Miranda2, Manuel Pereiro2, Anders Bergman2, Erik Sjöqvist2, Olle Eriksson2, Anna Delin1, and Danny Thonig3 — 1Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, Sweden — 2Department of Physics and Astronomy, Uppsala University, Sweden — 3School of Science and Technology, Örebro University, Sweden
In recently emerging coupled spin-lattice dynamics, it has been revealed that the energy dissipation in lattice dynamics (lattice damping) has a strong impact on the demagnetization rate [1]. However, the lattice damping remains the only parameter yet to be theoretically quantified. Here we present a new method to calculate the nonlocal lattice damping tensor using a Tight-binding approach implemented in Cahmd [2], with application on iron and cobalt. The lattice damping is calculated with a range of electron lifetimes and electron temperature. Given that the dissipation force's sum rule must adhere to Newton*s third law, the effective lattice damping (as observed in coherent phonon code) is zero. Furthermore, our results reveal that the lattice damping shows significant correlation to the density of states at Fermi level, which is similar to spin damping. Our work not only proposes a novel methodological framework to calculating lattice damping but also paves the way for deeper insights into the lattice dynamics of materials.
[1]Phys. Rev. B 106, 174407(2022) [2]available at https://cahmd.gitlab.io/cahmdweb/
Keywords: Lattice dynamics; Lattice damping; Tight-binding model; Energy dissipation; Demagnetization