Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.82: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

Complex magnetism in the Fe monolayer on Ir(001) — •Markus Hoffmann, Maren Kaluza, Tobias Dornheim, Bertrand Dupé, Paolo Ferriani, and Stefan Heinze — Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel

Recently, complex magnetic ground states have been reported for a number of transition-metal nanostructures on surfaces [1-4]. The driving force behind these non-collinear spin structures is a competition of exchange, Dzyaloshinskii-Moriya (DM) and higher-order spin interactions. For an Fe monolayer on Ir(111) this leads to the formation of an atomic-scale magnetic skyrmion lattice [4]. Here, we present a first-principles study of the magnetic properties of the Fe monolayer on Ir(001) based on density-functional theory using the full-potential linearized augmented plane wave (FLAPW) method. We map our total energy calculations of spin spirals to a Heisenberg model to obtain the exchange constants. By including spin-orbit coupling we also find the strength of the DM interaction and the magnetocrystalline anisotropy. We demonstrate that higher-order spin interactions are non-negligible in this system. Based on the obtained magnetic interactions, we perform Monte-Carlo simulations and simulate spin-polarized scanning tunneling microscopy images.

[1] P. Ferriani et al., Physical Review Letters 101, 027201 (2008)

[2] Y. Yoshida et al., Physical Review B 85, 155406 (2012)

[3] M. Menzel et al., Physical Review Letters 108, 197204 (2012)

[4] S. Heinze et al., Nature Physics 7, 713 (2011)

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