Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Surface Magnetism (jointly with MA)

O 71.13: Vortrag

Donnerstag, 14. März 2013, 18:30–18:45, H3

Ab initio study of ferromagnetic Co-chains on the (5x1) Iridium(001) surface — •Bertrand Dupe¹, Yuriy Mokrousov², and Stefan Heinze¹ — ¹Institut für Theoretische Physik und Astrophysik, CAU Kiel, Germany — ²Peter Grünberg Institut and Institute for Advanced Simulation Forchungszentrum Jülich,Jülich, Germany

Nanostructures of 3d transition metals on 4d or 5d substrates have been shown to exhibit complex spin structures [1-4]. A recent study demonstrated the intriguing magnetism of Fe biatomic chains on the (5x1) reconstructed Ir(001) surface due to the interplay of magnetocrystalline anisotropy, Dzyaloshinskii-Moriya interaction and exchange interaction [4]. Here, we use first-principles calculations based on density functional theory to explore Co biatomic chains on the (5x1) Ir(001) surface. Due to the key role of 3d-5d hybridization for the magnetic properties of such systems [5], we study Co chains in different structural arrangements and the impact of structural relaxations. We report the magnetic properties of the Co chains such as the magnetocrystalline anisotropy energy and the spatial distribution of spin-polarization. We compare our results with recent spin-polarized STM experiments [6].

[1] B. Hardrat et al. PRB 79, 094411 (2009) [2] S. Heinze et al. Nature Phys. 7, 713 (2011) [3] Y. Yoshida et al., PRL 108, 087205 (2012) [4] M. Menzel et al PRL, 108, 197204 (2012) [5] S. Baud et al Phys. Rev. B 73, 104427 (2006) [6] J. Bickel, K. et al to be published