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MA: Fachverband Magnetismus

MA 4: Bio- und molekularer Magnetismus

MA 4.1: Talk

Monday, March 7, 2016, 09:30–09:45, H33

X-ray magnetic circular dichroism on self-assembled Fe₄ SMMs at surfaces — •Luca Gragnaniello¹, Philipp Erler¹, Stefano Rusponi², Peter Schmitt³, Andreas Irmler¹, Fabian Paschke¹, Sabina Simon¹, Nicole Barth¹, Thomas Huhn³, Harald Brune², Fabian Pauly¹, and Mikhail Fonin¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — ²Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland — ³Fachbereich Chemie, Universität Konstanz, 78457 Konstanz, Germany

By using electrospray ion beam as a soft deposition method in ultra-high vacuum, we were able to organize Fe₄ SMMs in a highly regular superstructure on hexagonal boron nitride/Rh(111) [1] and graphene/Ir(111) templates, as evidenced by scanning tunneling microscopy measurements. On both these substrates Fe₄ SMMs lay on the surface with a well-defined flat geometry, corresponding to a homogeneous out-of-plane orientation of the magnetization easy axis of the molecules. Through x-ray magnetic circular dichroism measurements on those systems, we revealed that the magnetic anisotropy of SMMs can be deeply influenced by the choice of the substrate.

[1] P. Erler et al., Nano Lett. 15, 4546-4552 (2015)