Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Non-ultrafast magnetization dynamics

MA 23.1: Vortrag

Mittwoch, 14. März 2018, 09:30–09:45, H 0112

Quantitative comparison of different methods for the Gilbert damping in clean ferromagnets. — •Jens Renè Suckert, Filipe Souza Mendes Guimarães, Jonathan Chico, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

The Gilbert damping constant describes relaxation in magnetic systems. Efforts to describe the damping from first principles have been made for almost 50 years [1]. A multitude of approaches to calculate the damping have been proposed since then [1,2,3]. Still, a disparity between theoretical and experimental descriptions at low temperatures [3] and between different theoretical approaches persists. In particular, the behaviour of clean ferromagnets at low temperatures is still debated [4]. In this work, we present calculations of the damping constant for clean Fe, Ni and Co bulk systems using a unified framework based on a multi-orbital tight-binding model to investigate the different approaches and resolve the disparity at low temperatures.
This work is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator grant 681405 – DYNASORE).
[1] V. Kamberský, Czech J. Phys. 26, 1366 (1976).
[2] A. Brataas, et al., Phys. Rev. Lett. 101, 037207 (2008).
[3] S. Mankovsky et al., Phys. Rev. B 87, 014430 (2013).
[4] D.M. Edwards, J. Phys.: Condens. Matter 28, 086004 (2016).