Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Spin Structures at Surfaces and in thin films II

MA 53.4: Vortrag

Freitag, 4. April 2014, 10:15–10:30, BEY 118

Magnetic hardening induced by nonmagnetic organic molecules — •Martin Callsen, Vasile Caciuc, Nikolai Kiselev, Nicolae Atodiresei, and Stefan Blügel — Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

One target of molecular spintronics is to design new, molecule based magnetic materials with predefined magnetic and electronic properties for spintronic applications. By means of ab initio calculations in the framework of density functional theory we revealed that the adsorption of a nonmagnetic π-conjugated organic molecule on a ferromagnetic surface locally increases the strength of the magnetic exchange interaction between the magnetic atoms binding directly to the molecule [1]. In particular, we investigated the prototypical, biplanar [2,2]paracyclophane molecule adsorbed on the Fe/W(110) surface. The observed magnetic hardening effect leads to the creation of a local molecule mediated magnetic unit with a stable magnetization direction and an enhanced barrier for the magnetization switching as compared to the clean surface. In addition, this hybrid organic-ferromagnetic system exhibits a spin-filter functionality with sharp spin-split molecular-like electronic features at the molecular site.

[1] M. Callsen et al., Phys. Rev. Lett. 111, 106805 (2013)