SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.2: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Spin Dynamics in Magnetic Nanojunctions — •Rudolf Smorka¹, Martin Žonda², and Michael Thoss¹ — ¹Institute of Physics, Albert-Ludwigs-Universität Freiburg, Germany — ²Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University Prague, Czech Republic

Recent experimental advances of atomic and nanoscale magnetism motivate the study of spin dynamics on ultrafast time scales. In this contribution, we use a quantum-classical hybrid approach to study current-driven magnetization dynamics in systems consisting of tight-binding electrons and localized classical spins. Using this approach, we show that both the electronic structure of the central system and the self-consistent feedback of spin and electron dynamics play a significant role in the dynamical properties of magnetic nano-junctions with applied dc voltage. Specifically, relaxation dynamics can be enhanced by tuning the dc voltage in resonance with electronic levels of the central system. We analyze this characteristic in nano-junctions containing a single classical Kondo impurity. Furthermore, we investigate current-induced spin-transfer-torques (STT) in a ferromagnetic spin valve far away from equilibrium and show that electronic levels in the bias window lead to an enhancement of the STT.