Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 74: Surface and Interface Magnetism II (O jointly with MA)
O 74.8: Vortrag
Donnerstag, 3. April 2014, 12:15–12:30, WIL C107
Engineering Giant Magnetic Anisotropy and Kondo Resonances in Cobalt Adatoms on the h-BN Nanomesh — •Peter Jacobson1, Tobias Herden1, Markus Ternes1, and Klaus Kern1,2 — 1Max-Planck-Institute for Solid State Research, D-70569 Stuttgart, Germany — 2Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
The magnetic properties of Cobalt adatoms on the h-BN/Rh(111) nanomesh have been investigated by scanning tunneling microscopy at low temperatures (1.5 K) and high magnetic fields (10 T). Isolated Co adatoms show a pronounced Kondo resonance consistent with a spin-1 system with an estimated Kondo temperature well below 1 K possessing negligible magnetic anisotropy. Addition of hydrogen to the Co adatoms results in a remarkable shift in the magnetic properties, the Kondo resonance disappears and inelastic spin flip excitations are observed. The Co-H species remains in a spin-1 state and the spin flip excitations indicate that this species has a substantial magnetic anisotropy of 5 meV. The large magnetic anisotropy is attributed to an unquenched orbital moment. Given the dramatic changes upon hydrogen adsorption, we consider the 'molecular' Co-H system an ideal test system for engineering the magnetic anisotropy in molecular magnets.