Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 21: Elektronische Struktur II

O 21.5: Talk

Saturday, March 5, 2005, 11:45–12:00, TU EB107

k-dependent electronic structure of NiMnSb single-crystal surfaces — •Juliet Correa, Christian Eibl, Jürgen Braun, Georgi Rangelov, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

The half-Heusler alloy NiMnSb is believed to be a half-metallic ferromagnet with 100% spin polarization at the Fermi level. This property makes it an interesting material for spintronic applications. Detailed understanding of the band structure of NiMnSb, not only in the bulk but also at surfaces and interfaces, is essential to developing spintronic applications. To date, however, the only data available are of the density of states, specifically from polycrystalline samples. We present angle-resolved photoemission results from a carefully prepared and surface-characterized NiMnSb(100) single crystal. We observed clear energy dispersion of occupied bulk states as a function of the wave vector parallel to the surface. Our results are discussed along with band structure calculations.