Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 8: Surface Magnetism
MA 8.2: Vortrag
Montag, 27. März 2006, 15:15–15:30, HSZ 103
Polarised Synchrotron Radiation and Angle-Resolved Photoemission for Spin Resolution on Valence Band States without Mott Detectors — •Mattia Mulazzi1,2, Michael Hochstrasser3, Ivana Vobornik2, Jun Fujii2, Martina Corso4, Jürg Osterwalder4, and Giorgio Rossi1,2 — 1Department of Physics, University of Modena, Modena, Italy — 2INFM-TASC, Trieste, Italy — 3Laboratorium für Festkörperphysik, ETH Zürich, Zürich, Switzerland — 4Physik-Institut, Universität Zürich, Zürich, Switzerland
Magnetic dichroism in core-level photoemission proved to be a very powerful technique to investigate the properties of magnetic crystals. To equivalent experiments on the valence bands less efforts have been devoted because of the intrinsic complexity of the electron states. In this work we report on angle-resolved photoemission data taken with polarised synchrotron light on the Ni(111) valence band. At particular k-vectors Ni(111) shows sp states spin split by the exchange interaction. Momentum distribution curves have been measured as a function of the azimuthal emission angle, of the photon energy and polarisation and of the magnetisation state of the crystal to detect a signature of the sp states spin in a spin-integrated experiment. As soon as the photon polarisation or energy are changed, matrix elements intervene mixing to the purely magnetic effects. A comparison of data to calculated spectra obtained from a layer-KKR computational scheme resulted necessary to disentangle the two phenomena giving a better understanding of the magnetic dichroism in valence band and the Ni(111) sp states spin polarisation without a time-consuming Mott scattering experiment.