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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.83: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

Magnetic interactions and spin dynamics in one-dimensional ordered alloys at step edges of vicinal Pt surfaces. — •Oleg P. Polyakov^1,2, Oleg V. Stepanyuk^1,2, Dmitry I. Bazhanov^1,2, Alexander M. Saletsky¹, and Valeri S. Stepanyuk² — ¹Faculty of Physics, Moscow State University, GSP-1, Lenin Hills, 119991 Moscow, Russia — ²Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Properties of low-dimensional atomic structures is a subject for intensive experimental and theoretical investigation in recent years. One of the most notable systems for further fundamental investigation are atomic chains and wires deposited on various surfaces [1]. In this work we present the first-principles study of the magnetic behavior in transition metals (TM=Mn, Fe, Co, Ni) based one-dimensional monatomic and alloyed wires on vicinal Pt(111) surfaces which could be deposited at their step edges. We demonstrate that atomic wires can exhibit ferromagnetic or anti-ferromagnetic orderings due to their atomic structure and interatomic exchange interactions between different atoms and atom types (TM-TM, TM-Pt) at step edges. We find that the value of exchange interaction between TM atoms in atomic wires can be drastically changed or switch a sign by Pt atoms incoming from the step edges. Also, we show that magnetic anisotropy energy is strongly affected in that case. The spin-dynamics is investigated by means of kinetic Monte Carlo method based on transition-state theory. This work was supported by the RFBR grant RFBR N13-02-01322.

[1] P. Gambardella et al. Nature (London) 416, 301 (2002).