Nuclear magnetic resonance reveals structural evolution upon annealing in epitaxial Co2MnSi Heusler films

S. Rodan, A. Alfonsov, M. Belesi, F. Ferraro, J. T. Kohlhepp, H. J.M. Swagten, B. Koopmans, Y. Sakuraba, S. Bosu, K. Takanashi, B. Büchner, S. Wurmehl

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13 Citations (Scopus)

Abstract

Co2MnSi films were recently reported to show a significant increase in current-perpendicular-to-plane-giant-magnetoresistance upon annealing. Here, nuclear magnetic resonance was used to study the impact of annealing on the structure of such films. Below 550°C, no long-range L 2 1-order is observed, while annealing above 550°C leads to the formation of the ideal L 2 1 configuration, however, with a distinct degree of off-stoichiometry. Further evidence from restoring field measurements hints that interdiffusion may account for the drop in magnetoresistance observed for samples annealed above 600°C. These results show that optimizing films for spintronics involves the identification of the best annealing temperature, high enough for long-range order to emerge, but low enough to maintain smooth interfaces.

Original languageEnglish
Article number242404
JournalApplied Physics Letters
Volume102
Issue number24
DOIs
Publication statusPublished - 2013 Jun 17

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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