Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnetization and Demagnetization Dynamics II
MA 31.10: Vortrag
Mittwoch, 9. März 2016, 12:00–12:15, H34
Magnetic moment of inertia tensor from first principles — •Danny Thonig, Manuel Pereiro, and Olle Eriksson — Department of Material Theory, Uppsala University, Sweden
The evolution of atomic magnetic moments is well described in terms of precession and a damping for the adiabatic limit. Approaching the adiabatic limit, however, turned out to extend the Landau-Lifshitz-Gilbert equation by an inertia contribution [1]. Magnetic inertia ι is the resistance of the magnetic moment to relax, e.g. in ultra fast switching by an external magnetic field [2], that — to the best of our knowledge — have not been characterized on an ab initio basis.
We deduce the moment of inertia tensor from the breathing band model [3] and apply it in the framework of a renormalized Green function tight-binding approach. Slater-Koster parameters were obtained by a genetic-algorithm and Monte Carlo optimization with respect to first-principles results. Our model reveals that the moment of inertia tensor ιij is non-local and temperature dependent.
Our approach is applied to the bulk Stoner magnets and could be compared to recent experimental measurements [4]. Supported by atomistic magnetization dynamics simulations we reveal the importance of magnetic inertia in ultrafast relaxation processes.
[1] M.-C. Ciornei et al., Phys. Rev. B 83, 020410 (2011).
[2] D. Böttcher et al., Phys. Rev. B 86, 020404(R) (2012)
[3] V. Kamberský, Cz. Journal of Physics B 34, 1111 (1984)
[4] Y. Li et al., Phys. Rev. B 92, 140413(R) (2015)