Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Ultrafast Magnetization Effects 2
MA 25.6: Vortrag
Mittwoch, 7. September 2022, 16:15–16:30, H43
Heat-conserving three-temperature model for ultrafast demagnetisation simulations of nickel and iron — •Maryna Pankratova1, Ivan Miranda1, Danny Thonig2, 1, Manuel Pereiro1, Erik Sjöqvist1, Anna Delin3, Olle Eriksson1, 2, and Anders Bergman1 — 1Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden — 2School of Science and Technology, Örebro University, SE-701 82, Örebro, Sweden — 3Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, SE-10691 Stockholm, Sweden
In this work, we introduce a new heat-conserving three temperature model (HC3TM) for calculations of spin, electron, and lattice temperatures during ultrafast magnetisation dynamics simulations.
The proposed HC3TM has several advantages in comparison with the three-temperature model (3TM), proposed by Beurepaire. It reduces the reliance on heat transfer parameters, such as electron-spin, electron-lattice, and spin-lattice. These parameters are often hard to estimate which impedes the comparison with experimental data.
We apply HC3TM for the simulations of ultrafast demagnetisation of nickel and iron and compare the results with 3TM. HC3TM gives a demagnetisation rate during the first picoseconds after the absorption of a laser pulse which is in line with experiments. Overall, the proposed HC3TM reproduces experimental observations for nickel and iron better than most existing 3TM while it reduces the number of required parameters.