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MA: Fachverband Magnetismus
MA 12: Magnetization Dynamics and Damping
MA 12.2: Vortrag
Dienstag, 18. März 2025, 09:45–10:00, H19
Anisotropic energy dissipation in model Kagome systems — Rajgowrav Cheenikundil1, Zhiwei Lu2, Ivan Miranda3, Manuel Pereiro4, and •Danny Thonig1,4 — 1Örebro University, Sweden — 2KTH Royal Institute of Technology, Sweden — 3Linnaeus University, Sweden — 4University Uppsala, Sweden
Recent efforts have been directed towards understanding spin-orbit mediated phenomena such as the spin Hall effect [1], and energy dissipation phenomena [2], which are enhanced by non-collinear magnetism. Notably, the latter results in anisotropies in energy dissipation that have not been methodically investigated.
We employ the Kubo-Bastin formalism [3] of linear perturbation theory to calculate the non-local Gilbert damping tensor in a model Kagome system with Rashba spin-orbit coupling. This approach is implemented in the Cahmd code [4]. We vary the magnetic state according to different chiralities and phase differences.
Remarkably, the Bastin formalism connects the occurrence of anisotropic damping to a Fermi-sea contribution and, consequently, to spin-spin Berry curvature. Our systematic study examines the dependency of isotropic and anisotropic effective damping, as well as the full non-local damping, on electron lifetimes, Rashba parameters, and other factors. The results of this study pave the way for controlled dissipation in innovative spintronics applications.
[1] Scientific Reports 6, 28076 (2016); [2] Phys. Rev. Lett. 113, 266603 (2014); [3] Phys. Rev. B 102, 085113 (2020); [4] available at https://cahmd.gitlab.io/cahmdweb/
Keywords: Energy dissipation; Spin dynamics; Tight-Binding; Low-dimensional systems