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MA: Fachverband Magnetismus

MA 44: Surface Magnetism (Joint Session with O) - Adatoms on surfaces

MA 44.6: Talk

Thursday, March 19, 2015, 16:30–16:45, H 0110

Modifying the magnetic exchange coupling of hybrid organic-ferromagnetic interfaces — •Rico Friedrich, Vasile Caciuc, Nikolay S. Kiselev, Nicolae Atodiresei, and Stefan Blügel — Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

In molecular spintronics the properties of hybrid organic/ferromagnetic interfaces are of crucial importance [1]. Recently, it has been demonstrated by experimental and theoretical means [2] that an organic layer made of phenalenyl-based molecules on top of a cobalt contact can significantly modify the electronic and magnetic properties of the metal surface.

In this talk we outline a systematic study of this effect by investigating the influence of hetero-atoms within the organic molecules on the magnetic exchange coupling constant J between the surface Fe atoms below the molecule. Our results demonstrate, that a magnetic hardening can be specifically tuned when atoms like boron, carbon or nitrogen influence the magnetic exchange coupling. Moreover, a magnetic softening effect can be realized when either oxygen or a boron-carbon bond mediate the coupling between surface Fe atoms. Furthermore, we demonstrate that the most important contribution to the modification of the coupling constants is due to the hybridization between the electronic states of the molecule and those of the substrate.
N. Atodiresei et al., Physical Review Letters 105, 066601 (2010).
K. V. Raman et al., Nature 493, 509 (2013).