Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Surface Magnetism (jointly with MA)
O 71.7: Vortrag
Donnerstag, 14. März 2013, 16:45–17:00, H3
Scanning tunneling spectroscopy of quantum well states in thin Pd(001) films — •Sujit Manna1, Marek Przybylski1,2, and Jürgen Kirschner1,3 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland — 3Naturwissenschaftliche Fakultät II, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
Scanning Tunneling Spectroscopy (STS) on transition metals with filled d-bands below Fermi level is hardly expected to yield features due to the d-states because their contribution to the tunneling current is much smaller than that of the sp-band states. We have investigated the electronic structure of thin Pd films grown on Cu(001) by STS at T=4.7K with single layer thickness resolution. We have identified the occupied d-band quantum well states (QWS), which arise from the electron confinement along the growth axis of Pd films and give rise to sharp peaks in the tunneling spectra. A quantitative analysis of the spectra yields the band dispersion, which is similar to the calculated free electron dispersion in bulk Pd along the Γ-L direction. Also the correlation between the QWS formed in the Pd films with magnetic anisotropy (MA) of adjacent Co films in the Co/Pd bilayer system will be shown and discussed. The step induced uniaxial MA is found to oscillate as a function of Pd film thickness with a period of 6 ML, in agreement with theoretical calculations [1]. [1] M. Cinal, J. Phys.: Condens. Matter 13, 901 (2001).