Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 44: Spin Torque and Spin Excitations II
MA 44.5: Vortrag
Donnerstag, 3. April 2014, 16:00–16:15, HSZ 403
Spin Excitations in Individual Fe4 Molecular Magnets — •Jacob Burgess1,2, Luigi Malavolti3, Valeria Lanzilotto3, Matteo Mannini3, Shichao Yan1,2, Deung-Jang Choi1,2, Steffen Rolf-Pissarczyk1,2, Andrea Cornia4, Roberta Sessoli3, and Sebastian Loth1,2 — 1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg — 2Max Planck Institute for Solid State Research, Stuttgart — 3Department of Chemistry, University of Florence & INSTM, Italy — 4Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM, Italy
Single molecule magnets (SMMs) are in general large and fragile molecules. This constitutes a significant challenge in incorporating them into spintronics applications, and also to the investigation of the molecules via scanning tunneling microscopy (STM). The Fe4 molecule [1] stands out as an unusually robust SMM that can withstand thermal evaporation as well as a wide range of possible functionalizations.
Here we present the first STM investigations of individual Fe4 molecules thermally evaporated onto a single layer Cu2N on a Cu (100) crystal. Magnetic excitations at meV energies can be detected by inelastic electron tunneling spectroscopy. Comparison to the excitation spectrum computed from a Spin Hamiltonian accounting for all spins individually allows extraction of anisotropy and exchange parameters for isolated molecules. This experiment indicates the surface has a minimal effect on the magnetic anisotropy of Fe4 molecules.
[1] M. Mannini et al., Nature 468, 417 (2010).