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

Physics of Nanostructures

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

13 Citations (Scopus)

301 Downloads (Pure)

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 L2 1 -order is observed, while annealing above 550¿°C leads to the formation of the ideal L2 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
Pages (from-to)	242404-1/4
Number of pages	4
Journal	Applied Physics Letters
Volume	102
DOIs	https://doi.org/10.1063/1.4811244
Publication status	Published - 2013

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Rodan, S., Alfonsov, A., Belesi, M., Ferraro, F., Kohlhepp, J. T., Swagten, H. J. M., Koopmans, B., Sakuraba, Y., Bosu, S., Takanashi, K., Büchner, B., & Wurmehl, S. (2013). Nuclear magnetic resonance reveals structural evolution upon annealing in epitaxial Co2Mnsi Heusler films. Applied Physics Letters, 102, 242404-1/4. Article 242404. https://doi.org/10.1063/1.4811244

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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 L2 1 -order is observed, while annealing above 550¿°C leads to the formation of the ideal L2 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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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.

PY - 2013

Y1 - 2013

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 L2 1 -order is observed, while annealing above 550¿°C leads to the formation of the ideal L2 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 L2 1 -order is observed, while annealing above 550¿°C leads to the formation of the ideal L2 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.

U2 - 10.1063/1.4811244

DO - 10.1063/1.4811244

M3 - Article

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JO - Applied Physics Letters

JF - Applied Physics Letters

M1 - 242404

ER -

Nuclear magnetic resonance reveals structural evolution upon annealing in epitaxial Co2Mnsi Heusler films

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