Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)

Authors

Jan Honolka, Max-Planck-Institut für FestkörperforschungFollow
K. Kuhnke, Max-Planck-Institut für Festkörperforschung
L. Vitali, Max-Planck-Institut für Festkörperforschung
Axel Enders, University of Nebraska-LincolnFollow
K. Kern, Max-Planck-Institut für FestkörperforschungFollow
S. Gardonio, Istituto della Struttura della Materia C.N.R., Trieste, Italy
C. Carbone, Istituto della Struttura della Materia C.N.R., Trieste, Italy
S. R. Krishnakumar, International Centre for Theoretical Physics (ICTP), Trieste, Italy
P. Bencok, European Synchrotron Radiation Facility, Grenoble, France
S. Stepanow, Centre d’Investigacions en Nanociència i Nanotecnologia, Bellaterra, Spain
P. Gambardella, Institució Catalana de Recerca i Estudis Avançats (ICREA), Bellaterra, Spain

Date of this Version

2007

Comments

Published in PHYSICAL REVIEW B 76, 144412 (2007); DOI: 10.1103/PhysRevB.76.144412 ©2007 The American Physical Society. Used by permission.

Abstract

The magnetism of quench-condensed Ru and Rh impurities and metal films on Ag(100) and Pt(997) has been studied using x-ray magnetic circular dichroism. In the coverage range between 0.22 and 2.0 ML, no dichroic signal was detected at the M_3,2 absorption edges of Ru on Ag(100) at a temperature of 5 K in the presence of an applied magnetic field. The same was found for coverages between 0.12 and 0.5 ML of Rh on Ag(100) and Pt(997). It is concluded that the magnetic moments of single impurities, small clusters of various shape, and monolayers of the 4d metals are below the detection limit of 0.04 μ_B per atom. These results provide an unambiguous determination of the local magnetic moment of Ru and Rh deposited on nonmagnetic transition-metal surfaces, which are in contrast with theoretical predictions.