Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 21: Elektronische Struktur II
O 21.3: Vortrag
Samstag, 5. März 2005, 11:15–11:30, TU EB107
Spin Filtering at a Ferromagnetic-Paramagnetic Interface Observed by Spin-Polarized Standing Waves — •Jörg Schäfer1, Markus Hoinkis1, Eli Rotenberg2, and Ralph Claessen1 — 1Institut für Physik, Universität Augsburg — 2Advanced Light Source, Berkeley, USA
For thin Fe films the spin-selective transmission of electrons near the Fermi level across a ferromagnetic-paramagnetic interface is investigated. The majority and minority Fermi surface sheets of the Fe film are probed for standing wave formation by angle-resolved photoemission. Knowledge of the exchange-split Fermi surface from density functional calculations allows straightforward assignment of the spin character. Reflection at the interface is expected to lead to quantum well states. However, using a W(110) substrate, these are observed only for majority states, which is attributed to a strongly spin-dependent transmission through the Fe/W interface. This can be traced back to the Fermi surface topologies of the connecting solids, and the choice of the Fe/W-interface for this reason produces a particularly strong effect.