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Electronic and magnetic properties of thin films probed by Auger photoelectron coincidence spectroscopy (APECS) (Articolo in rivista)

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Electronic and magnetic properties of thin films probed by Auger photoelectron coincidence spectroscopy (APECS) (Articolo in rivista) (literal)

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Gotter R(1); Offi F(2); Da Pieve F(2); Ruocco A(2); Stefani G(2); Ugenti S(3); Trioni MI(4); Bartynski RA(5) (2007)
Electronic and magnetic properties of thin films probed by Auger photoelectron coincidence spectroscopy (APECS)
in Journal of electron spectroscopy and related phenomena (Print)
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Gotter R(1); Offi F(2); Da Pieve F(2); Ruocco A(2); Stefani G(2); Ugenti S(3); Trioni MI(4); Bartynski RA(5) (literal)

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(1) Laboratorio Nazionale TASC-INFM-CNR, Area Science Park, S.S. 14 Km 163.5, I-34012 Trieste, Italy (2) CNISM and Dipartimento di Fisica, Universit`a Roma Tre, Via della Vasca Navale 84, I-00146 Rome, Italy (3) Dipartimento di Fisica, Universit`a di Roma Tor Vergata, Via della Ricerca Scientifica 1, I-00133 Rome, Italy (4) CNISM UdR Milano-Bicocca, Via Cozzi 53, I-20125 Milano, Italy (5) Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers University, Piscataway, NJ 08854, USA (literal)

Titolo

Electronic and magnetic properties of thin films probed by Auger photoelectron coincidence spectroscopy (APECS) (literal)

Abstract

The recently discovered capabilities of Auger-photoelectron coincidence spectroscopy (APECS), i.e., the emission depth selectivity and the final spin state selectivity, are reviewed and discussed as a tool for the study of complex systems like magnetic thin films and multilayers. After a brief overview of these recent findings and a description of a clear experimental evidence for a dichroic effect in angle resolved (DEAR) APECS, results of coincidence Auger line shape applied to Co film on Cu(001), are presented. The geometrical configurations used, achieved by means of the high degree of freedom available in the experimental apparatus, are discussed in detail, as well as all the possible combinations that can provide a spin final state selectivity are presented. Due to the very high statistics achieved in the measurement, some finer details can be resolved at energies corresponding to transitions involving electrons from the top and the bottom of the valence band, when comparing singlet versus triplet contributions. As a first attempt and in the simplest approach, the observed dichroism can be explained by appropriate convolutions of the majority and minority densities of states, possibly corrected by a Cini-Sawatzky model for taking into account spin dependent correlation effects. (c) 2006 Elsevier B.V. All rights reserved. (literal)

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