Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Joint Session "Surface Magnetism I" (jointly with O)
MA 32.5: Vortrag
Mittwoch, 28. März 2012, 17:15–17:30, BH 243
Dzyaloshinskii-Moriya driven spin spiral in Mn chains on Pt(664) — •Benedikt Schweflinghaus1, Bernd Zimmermann1, Marcus Heide2, Gustav Bihlmayer1, and Stefan Blügel1 — 1Peter Grünberg Institut (PGI-1) & Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Department of Precision Science and Technology, Osaka University, Suita, Osaka 565-0871, Japan
Ferromagnetic Co chains decorating the step edges of Pt(997) are historically the prime example of a one-dimensional metallic magnet [1]. We investigate this system in the light of the recently discovered Dzyaloshinskii-Moriya interaction (DMI) for ultrathin films [2], which can induce spiral magnetic structures of unique rotational sense. Besides Co, the research was extended to Fe and Mn chains.
In this contribution we investigate these structures applying density functional theory (DFT) by means of the full-potential linearized augmented plane-wave (FLAPW) method as implemented in the FLEUR code [3]. Using a micromagnetic model that includes the spin stiffness, magnetic anisotropy energy (MAE) and the DMI, we study possible magnetic phases such as homogeneous and inhomogeneous spin spirals. While the DMI induces for Mn chains a large-period spiral magnetic state superimposed on an antiferromagnetic order, the MAE prevents such a noncollinear structure for Co and Fe chains, respectively.
[1] P. Gambardella et al., Nature 416, 301 (2002)
[2] M. Bode et al., Nature 447, 190 (2007)
[3] http://www.flapw.de