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

doi:10.1063/1.4811244

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

Materials Development Division

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	242404
Journal	Applied Physics Letters
Volume	102
Issue number	24
DOIs	https://doi.org/10.1063/1.4811244
Publication status	Published - 2013 Jun 17

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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@article{585751d588d74a71bed5a605e427bde1,

title = "Nuclear magnetic resonance reveals structural evolution upon annealing in epitaxial Co2MnSi Heusler films",

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.",

author = "S. Rodan and A. Alfonsov and M. Belesi and F. Ferraro and Kohlhepp, {J. T.} and Swagten, {H. J.M.} and B. Koopmans and Y. Sakuraba and S. Bosu and K. Takanashi and B. B{\"u}chner and S. Wurmehl",

note = "Funding Information: The authors thank J. J. P. A. W. Noijen and G. Baselmans for technical support, and R. M{\"u}ller for the casting and annealing of the polycrystalline samples. S.W. gratefully acknowledges funding by Deutsche Forschungsgemeinschaft DFG in the Emmy Noether programme, project WU595/3-1. ",

year = "2013",

month = jun,

day = "17",

doi = "10.1063/1.4811244",

language = "English",

volume = "102",

journal = "Applied Physics Letters",

issn = "0003-6951",

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number = "24",

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T1 - Nuclear magnetic resonance reveals structural evolution upon annealing in epitaxial Co2MnSi Heusler films

AU - Rodan, S.

AU - Alfonsov, A.

AU - Belesi, M.

AU - Ferraro, F.

AU - Kohlhepp, J. T.

AU - Swagten, H. J.M.

AU - Koopmans, B.

AU - Sakuraba, Y.

AU - Bosu, S.

AU - Takanashi, K.

AU - Büchner, B.

AU - Wurmehl, S.

N1 - Funding Information: The authors thank J. J. P. A. W. Noijen and G. Baselmans for technical support, and R. Müller for the casting and annealing of the polycrystalline samples. S.W. gratefully acknowledges funding by Deutsche Forschungsgemeinschaft DFG in the Emmy Noether programme, project WU595/3-1.

PY - 2013/6/17

Y1 - 2013/6/17

N2 - 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.

AB - 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.

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

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