Dresden 2011 – scientific programme

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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

Friday, March 18, 2011, 11:00–14:00, P2

Magnetic Properties of Nanowires and Nanocorrals at the Classical Level — •Nikolaos P. Konstantinidis¹ and Samir Lounis^2,3 — 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).