Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 28: Surface Magnetism I (jointly with O)

MA 28.6: Talk

Wednesday, March 9, 2016, 11:00–11:15, H31

Modification of spin Hamiltonian induced by molecular deformation of 3d β-diketonate complexes — •Hironari Isshiki, Jinjie Chen, Clemens Baretzky, Timofey Balashov, and Wulf Wulfhekel — Physikalisches Institut, Karlsruhe Institute of Technology

The magnetic anisotropy of a magnetic molecule is governed to the ligand field around the magnetic ion. The magnetic properties might be altered greatly by the deformation of the molecule. Recently, the tuning of magnetic anisotropy by molecular deformation of Fe-porphyrin was demonstrated [1].

Here, we investigated the alternation of magnetic properties by tip induced ligand deformation on 3d metals based β-diketonate complexes with scanning tunneling microscopy. We observed an inelastic excitation at 10 meV on a Co(II) molecule in dI/dV spectra, which is attributed to a spin-flip excitation. Approaching the tip to the molecule, a discontinuous change in current was observed, indicating contact formation and molecular deformation. Accompanying the deformation, an appearance of a Kondo resonance and a shift of the energy of the inelastic excitation were observed. We carried out similar measurements on Ni(II) and Cu(II) molecules.

[1] Nano Lett., 2015, 15, 4024-4028