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MA: Fachverband Magnetismus

MA 37: Spin Dependent Transport Phenomena

MA 37.13: Talk

Thursday, March 26, 2009, 18:30–18:45, HSZ 403

Transport through Single Molecule Magnets with Magnetic Field and Polarized Electrodes — •Nikolaos P. Konstantinidis^1,2,3 and Maarten R. Wegewijs^1,2,3 — ¹Institut für Theoretische Physik A, Physikzentrum, RWTH Aachen, 52056 Aachen, Germany — ²Institut für Festkörperforschung-Theorie III, Forschungszentrum Jülich, Leo-Brandt-Strasse, 52425 Jülich, Germany — ³JARA-Fundamentals of Future Information Technology

We investigate transport through single molecule magnets (SMMs) contacted by non-colinear magnetic and non-magnetic electrodes in the single electron tunneling regime. We show that an external magnetic field splits the negative differential conductance (NDC) that originates in weakly allowed spin-transitions between states in different charge sectors. The resulting current oscillations as a function of the applied voltage depend on the direction of the magnetic field relative to the easy axis of the molecule. We also show how Berry-phase interference appears as crossing and anticrossing lines in conductance maps in magnetic field and applied voltage. We analyze the detailed dependence of the current on the electrode polarizations and the arbitrary angles with each other and the easy axis of the SMM.