Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 26: Ultrafast Magnetization Effects I
MA 26.4: Talk
Wednesday, March 19, 2025, 15:45–16:00, H16
Spin-lattice modeling of elastic waves generated by ultrafast demagnetization in fcc Ni — •Ievgeniia Korniienko1, Pablo Nieves2, Alberto Fraile3, Roberto Iglesias2, and Dominik Legut1 — 1IT4Innovations, VSB-TU Ostrava, Ostrava, Czech Republic — 2University of Oviedo, Oviedo, Spain — 3Catalan Institute of Nanoscience and Nanotechnology (ICN2), Barcelona, Spain
Picosecond ultrasonics is a fast growing and advanced research field with broad application to the imaging and characterization of nanostructured materials as well as at a fundamental level. Experiments that provide direct, layer-specific, and quantitative information on the picosecond strain response [1], however, face comparably limited theoretical descriptions and modeling. In our work we propose a 3D model on the base of atomistic spin-lattice simulations [2] for laser-induced elastic response. As an example for testing our modeling approach we use ferromagnetic fcc Ni. Such choice allows us not only to calculate the lattice elastic response including ultrafast thermal expansion, but also to characterize the magnetic contribution to stress in this material [3]. The theoretical approach presented in our work [3] can be useful for further interpretations of experiments in the picosecond ultrasonics, as well as for providing other required parameters (like ultrafast thermal expansion coefficient) in micromagnetic models, e.g. within a multiscale approach. References: [1] M. Mattern, et al.: Photoacoustics 31, 100503 (2023); [2] P. Nieves, et al.: Phys. Rev. B 103, 094437 (2021); [3] I. Korniienko, et al.: Phys. Rev. Research 6, 023311 (2024).
Keywords: spin-lattice; ultrafast; demagnetization; ferromagnet