Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 2: Surface Magnetism and Spin Phenomena

O 2.2: Vortrag

Montag, 16. März 2015, 11:00–11:15, MA 004

Chiral magnetism in nanostructures of adatoms on Au(111) surface — •Juba Bouaziz, Stefan Blügel, and Samir Lounis — Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

We investigate possible chiral magnetic textures in superstructures made of 3d adatoms interacting via the Rashba spin-splitted surface state of Au(111) surface. We utilize multiple-scattering theory based on the Rashba model [1] to describe the related electronic structure and perform a mapping to an extended Heisenberg model and extract the tensor of magnetic exchange interactions among the adatoms. We find different type of interactions that can be of the same order of magnitude: a two-ion anisotropy term besides the usual isotropic exchange interaction and the Dzyaloshinskii-Moriya interaction. The inter-adatom distance controls the strength of these terms, which we exploit to design chiral magnetism for large nanostructures containing up to 169 adatoms deposited on Au(111) surface. Depending on the rim-decoration of the nanostructures, different chiral structures of skyrmionic type are obtained. Also different applied magnetic fields are considered while the evolution of the total energy and the topological charge of the nanoclusters are scrutinized.

[1] S. Lounis et al. Phys. Rev. Lett. 108, 207202 (2012)

This work is supported by the HGF-YIG Programme VH-NG-717 (Functional Nanoscale Structure and Probe Simulation Laboratory – Funsilab).