Spin-polarized surface state of MnSb(0001)

Rader, O.; Kamakura, N.; Kimura, A.; Lezaic, M.; Fujimori, A.; Blügel, S.; Kakizaki, A.; Miyanishi, S.; Akinaga, H.

doi:10.1088/1367-2630/7/1/111

Journal Article

Spin-polarized surface state of MnSb(0001)

Rader, O. ; Lezaic, M.FZJ* ; Blügel, S.FZJ* ; Fujimori, A. ; Kimura, A. ; Kamakura, N. ; Kakizaki, A. ; Miyanishi, S. ; Akinaga, H.

2005
Dt. Physikalische Ges. [Bad Honnef]

New journal of physics 7, 111 (2005) [10.1088/1367-2630/7/1/111]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1407 doi:10.1088/1367-2630/7/1/111

Abstract: Knowledge of the spin-dependent electronic structure at surfaces and interfaces plays an increasingly important role when assessing possible use of novel magnetic materials for spintronic applications. It is shown that spin- and angle-resolved photoelectron spectroscopy together with ab initio electronic structure methods provides a full characterization of the surface electronic structure of ferromagnetic MnSb(0 0 0 1). Two different surface reconstructions have been compared in spin- and angle-resolved valence-band photoemission. For annealing at elevated temperatures, the ( 1 x 1)-structure transforms into 2 x 2 and a majority-spin peak appears at - 1.7 eV inside a majority-spin bulk band gap at the surface Brillouin zone centre. Its sensitivity to oxygen supports an interpretation as magnetic compound surface state. Local spin density calculations predict at the same energy (- 1.75 eV) a prominent d(z)2 surface state of majority spin for ( 1 x 1)- Mn terminated MnSb(0 0 0 1) but no such feature for ( 1 x 1)-Sb termination. The calculation shows that neither the bulk nor the surface is half-metallic, in agreement with the expectation for the hexagonal NiAs structure.

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