Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.43: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Microscopic spin dynamics with coupling to a phonon bath — •Svenja Vollmar1,2, Alexander Baral1, and Hans Christian Schneider1 — 1Department of Physics and Research Center of OPTIMAS, University of Kaiserslautern — 2Graduate School of Excellence Materials Science in Mainz
To describe different aspects of magnetization dynamics, from magnetization precession to demagnetization dynamics, phenomenological models are used with considerable success. These usually include the spin-orbit interaction and treat certain interactions involving the spin degrees of freedom by introducing baths. Here we investigate different aspects of a s-d(f) model that explicitly includes itinerant charge carriers with spin, the spin-orbit coupling, and the exchange coupling to a localized spin system. Importantly, the interaction with the phonon bath is derived microscopically.
First, we focus on the interaction between antiferromagnetically coupled itinerant carriers and a macroscopin. We calculate the microscopic spin dynamics including a Rashba spin-orbit coupling and the coupling to a phonon bath. Additionally, we extrapolate dephasing and magnetization times.
Next, we investigate the intrinsic spin dynamics of a Heisenberg model coupled to a bath. We derive equations of motion for the excitations in the spin system (magnons) in order to study their relaxation dynamics. The coupling to a phonon bath is described by using a Lindblad-operator formalism.