Berlin 2008 – scientific programme

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DS: Fachverband Dünne Schichten

DS 2: Towards Molecular Spintronics

DS 2.4: Talk

Monday, February 25, 2008, 13:15–13:30, H 2013

Controlling the magnetization direction in molecules via oxidation state — Atodiresei Nicolae¹, Peter H. Dederichs¹, Yuriy Mokrousov², Lars Bergqvist¹, Gustav Bihlmayer¹, and •Stefan Blügel¹ — ¹Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany — ²Institute for Applied Physics, University of Hamburg, 20355 Hamburg, Germany

By means of ab initio calculations we predict that it is possible to manipulate the magnetization direction in organic magnetic molecules by changing their oxidation state. We demonstrate this novel effect on the Eu₂(C₈H₈)₃ molecule, in which the hybridisation of the outer π-rings states with the Eu 4f-states causes a redistribution of the orbitals around the Fermi level leading to a strong ferromagnetism due to a hole-mediated exchange mechanism. As a key result, we predict an oscillatory behavior of the easy axis of the magnetization as a function of the oxidation state of the molecule - a new effect, which could lead to revolutionary technological applications. Support by the DFG-SPP 1243 is gratefully acknowledged.