Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Surface magnetism I

MA 41.12: Vortrag

Donnerstag, 15. März 2018, 12:30–12:45, EB 202

Elliptical spin excitations by engineering the magnetic interactions of Fe adatoms and dimers on Cu(111) — •Filipe Souza Mendes Guimarães, Manuel dos Santos Dias, Benedikt Schweflinghaus, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

We investigate the role of spin-orbit coupling on the spin dynamics of Fe adatoms and dimers deposited on the Cu(111) [1]. The spin excitations of an Fe adatom can be surprisingly anisotropic and may be controlled either via a large in-plane external magnetic field, or by forming a dimer with a neighboring Cu adatom, as previously shown on a semi-insulating surface [2]. We also consider spin excitations of two kinds of Fe dimers. While the dimer with nearest-neighbor separation is strongly ferromagnetic, and its lowest spin excitation can be described as the elliptical precession of a giant spin with biaxial magnetic anisotropy, the one with twice the separation has an antiferromagnetic ground state but also present a ferromagnetic metastable state thanks to the magnetic anisotropy. For the latter, we explore the spin excitations from both kinds of magnetic states, and propose that the metastable state can be accessed with a pump-probe STM experiment [2]. This work is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator grant 681405 – DYNASORE).
[1] F. S. M. Guimarães et al., Phys. Rev. B 96, 144401 (2017)
[2] S. Loth et al., Science 329, 1628 (2010)