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MA: Fachverband Magnetismus
MA 21: Ultrafast Magnetization II
MA 21.7: Vortrag
Dienstag, 17. März 2020, 11:00–11:15, HSZ 101
Spin-lattice dynamics from isotropic and anisotropic exchange — •Danny Thonig1, Jacob Persson2, Johan Hellsvik3,4, Lars Nordström2, Manuel Pereiro2, and Jonas Fransson2 — 1School of Science and Technology, Örebro University, SE-70182 Örebro, Sweden — 2Department of Material Theory, Uppsala University, Sweden — 3Department of Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden — 4Nordita, SE-106 91 Stockholm, Sweden
The understanding how magnons couple with phonons is of fundamental importance. It is dominantly caused by distance dependent exchange between the magnetic moment, such as RKKY-like Heisenberg or dipole-dipole interaction. Both exhibits changes in the magnetic order, say from ferro to antiferromagnetic states, related to the crystal structure, which is affected by displacements and call for deeper studies.
We report on an investigation of atomistic coupled spin-lattice dynamics by means of the Landau-Lifshitz-Gilbert and Newton equation. The exchange and force constant parameters of the Hamiltonian are approached by RKKY, Dzyaloshinskii-Moriya, and dipole-dipole interaction as well as Born-Landé exchange, respectively.
For low dimensional systems, we focus on the evolution from disordered to ordered states in dependence on temperature, island size, and external magnetic field. It turns out that spin and displacements have a crucial influence on each other, especially near magnetic order changes.