Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Surface Magnetism and Spin Phenomena
O 32.8: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
The magnetic properties of CoHn complexes on h-BN/Rh(111) — •Matthias Muenks1, Peter Jacobson1, Tobias Herden1, Gennadii Laskin1, Oleg Brovko2, Markus Ternes1, and Klaus Kern1,3 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Max Planck Institute of Microstructure Physics, Halle, Germany — 3École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
Transition metal adatoms on decoupling layers, such as h-BN/Rh(111), have peaked interest because they provide a testbed for magnetic properties at the single atomic scale. Intriguing features such as a high magnetic anisotropy of Co adatoms on MgO [1] or the controlled ionization of Co adatoms on graphene [2] are among these exciting results. Here we use a combined STM/AFM working at 1.2 K and magnetic fields up to 14 T to investigate CoHn complexes that adsorb on the highly corrugated h-BN/Rh(111) Moiré [3] [4]. We found that CoH2 shows a Kondo resonance characteristic for a spin-1/2 system, whereas CoH molecules have a clear spin-1 signature. For these spin-1 systems we present experimental proof of the correlation between the magnetic anisotropy energy and the coupling strength to the substrate. The result is supported by theoretical calculations.
[1] I. G. Rau et al., Science 344 (6187), pp. 988-992 (2014) [2] V. W. Brar et al., Nature Physics 7 , pp. 43-47 (2011) [3] T. Herden et al., Nano Letters 14 (6), pp. 3623-3627 (2014) [4] F. D. Natterer et al., PRL 109, pp. 066101 (2012)