Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.7: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Magnetic Properties of Nanowires and Nanocorrals at the Classical Level — •Nikolaos P. Konstantinidis1 and Samir Lounis2,3 — 1Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany — 2Department of Physics and Astronomy, University of California Irvine, California, 92697 USA — 3Institut für Festkörperforschung and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
The bottom-up approach is one of the main focus research areas of nanoscience where various atomic structures, e.g. corrals of adatoms and nanowires, are engineered atom by atom with a scanning tunneling microscope [1,2]. Our contribution addresses the magnetic properties of such systems whereby one more or less adatom is crucial. We use a classical Heisenberg model for the spins of the nanostructures. If the magnetic exchange interaction between nearest neighbors is of antiferromagnetic type, complex magnetic textures can arise provided an external magnetic field is applied or a magnetic coupling to a ferromagnetic substrate exists. Within this model, the corral of adatoms forms an open or a closed chain. We show that the spin configuration of the system can be tuned to a non-collinear or to a ferromagnetic state by adjusting its number of sites, the location of the adatom or the strength of the coupling to the ferromagnetic substrate.
[1] Manoharan et al., Nature 403, 512 (2000).
[2] Gambardella et al., Science 300, 1130 (2003).