Magnetization-induced symmetry breaking at the surface of ferromagnetic Ni(111)M. Mulazzi1, 2, M. Hochstasser2, 3, J. Fujii2, I. Vobornik2, G. Rossi1, 2 and J. Henk4
1 Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia - Via Campi 213/A, I-41100 Modena, Italy, EU
2 Laboratorio Nazionale TASC, INFM-CNR, Area Science Park Basovizza - I-34012 Trieste, Italy, EU
3 Laboratorium für Festkörperphysik - Wolfgang-Pauli-Str. 16, ETH Hönggerberg, CH-8093 Zürich, Switzerland
4 Max-Planck-Institut für Mikrostrukturphysik - Weinberg 2, D-06120 Halle (Saale), Germany, EU
received 5 December 2007; accepted in final form 7 April 2008; published June 2008
published online 19 May 2008
The exchange-split sp states of Ni(111) are investigated for different magnetization conditions by means of angle-resolved photoelectron spectroscopy with polarized synchrotron radiation. Significant shifts of intensity maxima in both energy and wave vector are found upon reversal of the magnetization. The shifts, not present in demagnetized samples, are unequivocally related to the direction of the magnetization vector and, hence, attributed to the spin-orbit interaction. Symmetry considerations corroborate that the experimental findings are related to magnetization-induced explicit symmetry breaking at fcc(111) surfaces.
75.70.-i - Magnetic properties of thin films, surfaces, and interfaces.
79.60.-i - Photoemission and photoelectron spectra.
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