Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 14: Focus Session: Physics of Quantum Rings (organized by HL)

TT 14.4: Vortrag

Montag, 31. März 2014, 11:15–11:30, POT 151

Current-induced spin dynamics in ring-like atom clusters on surfaces — •Benjamin Baxevanis, Christoph Hübner, Lars-Hendrik Frahm, and Daniela Pfannkuche — I. Institut für Theoretische Physik, Universität Hamburg, Germany

Recently, much attention has been devoted to artificially assembled magnetic structures made of iron atoms on non-magnetic substrates using a scanning tunneling microscope [1,2,3]. Some of these structures show unique dynamics and switching of magnetism under the influence of a spin-polarized current and the interaction with the substrate [2,3]. We theoretically consider the spin dynamics in a ring-like cluster of Fe atoms on a substrate tunnel-coupled to a magnetic tip. Employing a master equation approach, the effects of the spin-polarized current, anisotropy field and symmetry of the ring-like cluster [4] on the spin dynamics are studied.

[1] A. A. Khajetoorians, J. Wiebe et al., Nature Physics 8, 497 (2012)

[2] S. Loth, S. Baumann, C. P. Lutz et al., Science 335, 196 (2012)

[3] A. A. Khajetoorians, B. Baxevanis et al., Science 339, 55 (2013)

[4] B. Baxevanis and D. Pfannkuche, in: V. M. Fomin (Ed.), Physics of Quantum Rings, Springer, Berlin-Heidelberg, 2014, pp. 381-408.