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MA: Fachverband Magnetismus

MA 30: Ultrafast Magnetization III

MA 30.11: Vortrag

Mittwoch, 18. März 2020, 12:15–12:30, HSZ 101

Nonlocal Gilbert damping and magnetic interactions in noncollinear magnetic nanostructures from first principles — Sascha Brinker, •Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany

Damping is essential to the magnetization dynamics underpinning the performance of any type of magnetic device. Utilizing a first-principles description of the spin dynamics of noncollinear magnetic nanostructures based on linear-response time-dependent density functional theory [1], we demonstrate that the Gilbert damping and gyromagnetic tensors can be expressed in terms of couplings, chiral or not, of the magnetic moments. We illustrate the theory considering magnetic adatoms, dimers and trimers, both within a generalized Alexander-Anderson model and using real magnetic atoms on Au(111) together with magnetic constraints [2]. These properties are related to the filling of the magnetic orbitals of the clusters, to their hybridization with the surface electrons, and to the role played by spin-orbit coupling. We put forward a generalized Landau-Lifshitz-Gilbert equation accounting for the dependence of damping on the underlying magnetic structure and address the case of different magnetic ground states and their dynamics. — Work funded by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator Grant No. 681405-DYNASORE).
[1] M. dos Santos Dias et al., Phys. Rev. B 91, 075405 (2015)
[2] S. Brinker et al., New J. Phys. 21, 083015 (2019)