Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Spin Transport and Orbitronics, Spin-Hall Effects

MA 24.5: Vortrag

Mittwoch, 7. September 2022, 16:00–16:15, H37

Spin Dynamics in Magnetic Nanojunctions — •Rudolf Smorka¹, Martin Žonda², and Michael Thoss^1,3 — ¹Institute of Physics, Albert-Ludwigs-Universität Freiburg — ²Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University Prague — ³EUCOR Centre for Quantum Science and Quantum Computing, Albert-Ludwigs-Universität Freiburg

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 driven by a 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 in a ferromagnetic spin valve far away from equilibrium and show that electronic levels in the bias window lead to an enhancement of the spin-transfer torques.