Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.15: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Spectroscopy of unoccupied states and spin-depolarization dynamics of materials with a high spin-polarization — •M. Cinchetti, O. Andreyev, M. Sánchez-Albaneda, P. Wüstenberg, M. Bauer, and M. Aeschlimann — Universität Kaiserslautern

Half-metallic ferromagnetic Heusler alloys have been studied with two-photon photoemission (2PPE) spectroscopy. First spin-resolved measurements have been performed in order to investigate the behaviour of the surface spin polarization and its dependence on the surface preparation procedure. They show that significant changes occur in the spin polarization depending on the surface preparation. Moreover, the spin-dependent energy relaxation of excited electrons is under study using a pump-probe technique (time-resolved 2PPE). The obtained results give insight into the fundamental mechanisms of spin depolarization at the surface of half-metallic ferromagnets.

Funded by DFG: FOR 559/1