Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Electronic Structure and Spin-Orbit Interaction I

O 8.6: Vortrag

Montag, 31. März 2014, 11:45–12:00, GER 38

Chiral magnetism of magnetic adatoms from Rashba electrons — •Juba Bouaziz¹, Manuel dos Santos Dias¹, Abdelhamid Ziane², Mouloud Benakki², Stefan Blügel¹, and Samir Lounis¹ — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany — ²Laboratoire de Physique et Chimie Quantique, Faculté des Sciences, Université Mouloud Mammeri, 15000 Tizi-Ouzou, Algeria

We investigate chiral magnetic long-range interactions among adatoms mediated by surface states spin-splitted by spin-orbit coupling. Using the Rashba model, the tensor of exchange interactions is extracted wherein a two-ion anisotropy term is found besides the usual isotropic exchange interaction (J) and the Dzyaloshinskii-Moriya interaction (DM). The inter-adatom distance controls the strength of these terms which we exploit to design chiral magnetism in Fe nanotructures on Au(111) surface. In contrast to [1], we include without approximation the contribution of the integrable singularity observed at the extremum of the dispersion curve. When the magnetic moments are out-of-plane, we demonstrate within a simple approach that J and DM are respectively related to superpositions of the out-of-plane and in-plane components of the skyrmionic magnetic waves induced by the adatoms in the surrounding electron gas [2].

This work is supported by the HGF-YIG Programme VH-NG-717 (Functional Nanoscale Structure and Probe Simulation Laboratory). [1] H. Imamura et al. Phys. Rev. B 69, 121303 (2004)
[2] S. Lounis et al. Phys. Rev. Lett. 108, 207202 (2012)