Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnetization and Demagnetization Dynamics II
MA 31.3: Vortrag
Mittwoch, 9. März 2016, 10:00–10:15, H34
Computer simulations on ultrafast magnetization dynamics in ferrimagnetic DyCo5 — •Andreas Donges1, Sergii Khmelevskyi2, Andras Deak3, Radu-Marius Abrudan4,5, Florin Radu4, Ilie Radu4,6, László Szunyogh3, and Ulrich Nowak1 — 1Universität Konstanz, 78457, Germany — 2Vienna University of Technology, 1040, Austria — 3Budapest University of Technology and Economics, 1111, Hungary — 4Helmholtz-Zentrum Berlin für Materialien und Energie, 12489, Germany — 5Ruhr-Universität Bochum, 44780 Germany — 6Technical University Berlin, 10623, Germany
Ferrimagnetic rare earth transition metal alloys have gained a lot of scientific attention, since the seminal work of Radu et al. [1], which showed that the magnetization of such a compound can be switched by a pure thermal excitation. The motivation for our research on DyCo5 is given by a variety of intriguing properties, especially its magnetization compensation point and its spin reorientation transition, where the easy axis changes from the in-plane to the out-of-plane direction [2]. We implemented a multi-scale model, combining ab-initio calculations with an atomistic spin model, to study how this spin reorientation affects magnetization dynamics on the ps and sub-ps time scales. Different dynamics are found, in response to an ultrafast laser excitation, for the in-plane and out-of-plane phases, as well as for the rare earth and transition metal sublattices.
[1] I. Radu, et al., Nature 472, 205-208 (2011)
[2] T. Tsushima, M. Ohokoshi, JMMM 31-34, 197-198 (1983)