Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 21: Elektronische Struktur II

O 21.3: Talk

Saturday, March 5, 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.