SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Poster Session V: Electron-driven processes at surfaces and interfaces
O 63.4: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Ultrafast lattice dynamics and microscopic energy flow in 3d ferromagnets — •Daniela Zahn1, Florian Jakobs2, Yoav William Windsor1, Hélène Seiler1, Thomas Vasileiadis1, Tim Butcher3, Yingpeng Qi1, Dieter Engel4, Unai Atxitia2, Jan Vorberger3, and Ralph Ernstorfer1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 3Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — 4Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin, Germany
The response of ferromagnets to laser excitation is governed by the interplay of electronic, magnetic and lattice degrees of freedom. The lattice plays an important role in the magnetization dynamics, since it drains energy from the electrons and absorbs angular momentum. Here, we study the lattice response of the 3d ferromagnets nickel, iron and cobalt directly using femtosecond electron diffraction. We compare the experimental results to spin-resolved DFT calculations combined with energy flow models. While the conventional two-temperature model is not in agreement with the experimental results, a consistent description of the laser-induced dynamics is achieved with energy-conserving atomistic spin dynamics simulations. Our results provide a clear picture of the microscopic energy flow between electronic, magnetic and lattice degrees of freedom on ultrafast timescales.