Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

Jan-Peter Wüstenberg, Roman Fetzer, Martin Aeschlimann, Mirko Cinchetti, Jan Minár, Jürgen Braun, Hubert Ebert, Takayuki Ishikawa, Tetsuya Uemura, and Masafumi Yamamoto
Phys. Rev. B 85, 064407 – Published 15 February 2012

Abstract

Using a combined approach of spin-resolved photoemission spectroscopy, band structure and photoemission calculations we investigate the influence of bulk defects and surface states on the spin polarization of nonstoichiometric Co2MnαSi thin films (with α=0.69 and α=1.19) with bulk L21 order. We find that for Mn-poor alloys the spin polarization at the Fermi energy (EF) is negative due to the presence of CoMn antisite and minority surface state contributions. In Mn-rich alloys, the suppression of CoMn antisites leads to a positive spin polarization at EF, and the influence of minority surface states on the photoelectron spin polarization is reduced.

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  • Received 28 October 2011

DOI:https://doi.org/10.1103/PhysRevB.85.064407

©2012 American Physical Society

Authors & Affiliations

Jan-Peter Wüstenberg*, Roman Fetzer, Martin Aeschlimann, and Mirko Cinchetti

  • Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödingerstr. 46, DE-67663 Kaiserslautern, Germany

Jan Minár, Jürgen Braun, and Hubert Ebert

  • Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 11, DE-81377 München, Germany

Takayuki Ishikawa, Tetsuya Uemura, and Masafumi Yamamoto

  • Division of Electronics for Informatics, Hokkaido University, Kita 14 Nishi 9, Sapporo 060-0814, Japan

  • *jpwuest@physik.uni-kl.de

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Issue

Vol. 85, Iss. 6 — 1 February 2012

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