Title:
Separating Exchange Splitting from Spin Mixing in Gadolinium by Femtosecond
Laser Excitation
Author(s):
Andres, Beatrice; Christ, Marc; Gahl, Cornelius; Wietstruk, Marko; Weinelt, Martin; Kirschner, Jürgen
Year of publication:
2015
Available Date:
2016-06-27T06:37:25.991Z
Abstract:
Employing spin-, time-, and energy-resolved photoemission spectroscopy, we
present the first study on the spin polarization of a single electronic state
after ultrafast optical excitation. Our investigation concentrates on the
majority-spin component of the d-band-derived Gd(0001) surface state d↑z2.
While its binding energy shows a rapid Stoner-like shift by 90 meV with an
exponential time constant of τE=0.6±0.1 ps, the d↑z2 spin polarization
remains nearly constant within the first picoseconds and decays with τS=15±8
ps. This behavior is in clear contrast to the equilibrium phase transition,
where the spin polarization vanishes at the Curie temperature.
Part of Identifier:
ISSN (print): 0031-9007
DDC-Classification:
530 Physik
Publication Type:
Wissenschaftlicher Artikel
Also published in:
Physical Review Letters. - 115 (2015), 20, S.Artikel Nr. 207404/1-5
URL of the Original Publication:
DOI of the Original Publication:
Department/institution:
Physik
Institut für Experimentalphysik
Comments:
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