Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Surface and Interface Magnetism I (O jointly with MA)
O 51.5: Vortrag
Mittwoch, 2. April 2014, 11:30–11:45, WIL C107
Complex trend of magnetic order in Fe clusters on Rh(111) and Ru(0001) — •Sören Krotzky1, Fabian Otte2, Violetta Sessi3, Carsten Tieg3, Paolo Ferriani2, Stefan Heinze2, Marta Wasniowska1, Jan Honolka1,4, and Klaus Kern1,5 — 1Max Planck Institute for Solid State Research, Stuttgart Germany — 2Institute of Theoretical Physics and Astrophysics, University of Kiel, Kiel Germany — 3European Synchrotron Radiation Facility, Grenoble France — 4Institute of Physics of the ASCR, Prague Czech Republic — 5Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne, Switzerland
We investigate the spin configurations in Fe clusters and monolayers on Ru(0001) and Rh(111) by means of X-ray magnetic circular dichroism experiments, first-principles calculations and Monte Carlo simulations. The importance of Fe 3d state itinerancy and its hybridization with partly filled 4d substrate bands will be studied for monoatomic height Fe clusters of different atomic size N and various geometries. Randomly positioned single Fe atom spins in the dilute regime (N = 1) indirectly interact via the Rudermann-Kittel-Kasuya-Yoshida mechanism, which shows inverted character on Ru(0001) and Rh(111). For Fe dimers we prove the antiferromagnetic (Ru) to ferromagnetic (Rh) cross-over of the nearest-neighbour exchange coupling constant J1. For larger clusters (i.e. 2 ≤ N ≤ 4) we show the onset of cluster geometry dependent compensated magnetic structures. Finally, we present experimental evidence for the formation of compensated spin textures both for Ru(0001) and Rh(111) in fully ordered epitaxial Fe islands.