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MA: Fachverband Magnetismus

MA 51: Magnetic Half-metals and Oxides II

MA 51.1: Vortrag

Donnerstag, 17. März 2011, 11:00–11:15, HSZ 401

Spin polarized surface states at the free Co₂MnSi (100) surface — •Roman Fetzer¹, Jan-Peter Wüstenberg¹, Jan Minàr², Jürgen Braun², Hubert Ebert², Takayuki Ishikawa³, Masafumi Yamamoto³, Martin Aeschlimann¹, and Mirko Cinchetti¹ — ¹Department of Physis and Research Center OPTIMAS, TU Kaiserslautern, Erwin Schrödingerstr. 46, D-67663 Kaiserslautern — ²Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstr. 11, 81377 München — ³Graduate School of Information Science and Technology, Hokkaido University, Kita 14 Nishi 9, Sapporo 060-0814, Japan

Interface states are believed to play a crucial role for the performance of Heusler-based magnetic tunnelling junctions [1]. As a first step towards the investigation of real interfaces, we present a comprehensive study of the free (001) surface of the Heusler alloy Co₂MnSi. We show the presence of minority electron surface states with predominant Δ₁ symmetry at the Fermi energy. Using a combined approach consisting of low energy electron diffraction, Auger analysis and spin-resolved photoelectron spectroscopy, the link between the spin-resolved electronic structure and the surface termination is drawn and substantiated by LSDA+DMFT photoemission calculations using different surface terminations.

[1] T. Ishikawa, N. Itabashi, T. Taira, K. Matsuda, T. Uemura, and M. Yamamoto. J. Appl. Phys. 105, 07B110 (2009).