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Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Surface magnetism II (jointly with O)

MA 40.7: Talk

Wednesday, March 16, 2011, 16:30–16:45, CHE 184

Observing the Spin of an Individual Mn12 Molecule — •Steffen Kahle1, Zhitao Deng1, Charlène Tonnoir1, Nicha Thontasen1, Gordon Rinke1, Nikola Malinowski1, Alicia Forment Aliaga1, Stephan Rauschenbach1, Markus Ternes1, and Klaus Kern1,21MPI for Solid State Research, Stuttgart — 2EPFL, Lausanne, Switzerland

The Mn12-acetate16 molecule (Mn12) is considered a prototypical single molecular magnet (SMM) because its high spin measured in bulk is commonly attributed as spin of the individual molecules [1]. To confirm this we want to measure the spin of an individual Mn12 molecule.

We are able to gently deposit Mn12 molecules on different metal substrates by electrospray ion beam deposition [2]. STM images show intact and individual addressable molecules, which can be resolved with submolecular resolution.

Low temperature (1K) scanning tunneling spectroscopy on top of the molecule adsorbed on bare metal is featureless near EF. This changes when we decouple the molecule from the metal adding a BN layer on the substrate before deposition. We now observe symmetric inelastic tunneling features around EF in the range of a few mV, which is ascribed to spin flip excitations. The excitation is delocalized evenly over the whole molecule supporting the giant-spin model.

This proofs the existence of a molecular spin, thus confirming the SMM nature of individual Mn12 molecules on the surface.

[1] R. Sessoli et. al., Nature 365, 141, (1993).

[2] N. Thontasen et. al., J. Phys. Chem. C 114, 17768, (2010).

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