Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Electronic Structure of Surfaces: Magnetism and Spin Phenomena II
O 14.9: Vortrag
Montag, 20. März 2017, 17:00–17:15, WIL C107
Potential Energy Driven Spin Manipulation via a Controllable Hydrogen Ligand — •Peter Jacobson1, Matthias Muenks1, Gennadii Laskin1, Oleg Brovko2, Valeri Stepanyuk3, Markus Ternes1, and Klaus Kern1, 4 — 1Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany — 2The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy — 3Max Planck Institute of Microstructure Physics, Weinberg 2, 06120, Halle(Saale), Germany — 4Institut de Physique, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
Spin-bearing molecules can be stabilized on surfaces and in junctions with desirable properties such as a net spin that can be adjusted by external stimuli. Using scanning probes, initial and final spin states can be deduced from topographic or spectroscopic data, but the transition mechanism between these states is largely unknown. We address this question by manipulating the total spin of cobalt complexes on a h-BN surface with a H-functionalized scanning probe tip by simultaneously tracking force and conductance. When the additional H ligand is brought close to the CoH, switching between a correlated S = 1/2 Kondo state and a S = 1 state with anisotropy is observed. We show that the total spin changes when the system is transferred onto a new potential energy surface defined by the position of the H in the junction. These results show how and why chemically functionalized tips are an effective tool to manipulate adatoms and molecules, and a promising new method to selectively tune spin systems.