Mn-55 NMR study of quaternary half-metallic ferromagnetic Co2Mn1-xFexSi Heusler compounds

S. Wurmehl, A. Alfonsov, J.T. Kohlhepp, H.J.M. Swagten, B. Koopmans, M. Wójcik, B. Balke, V. Ksenofontov, C.G.F. Blum, B. Büchner

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Samenvatting

In this work, the 55 Mn spin-echo nuclear magnetic resonance technique is used to systematically analyze the complete substitutional series Co 2 Mn 1-x Fe x Si in terms of the resonance frequencies of the satellite structure and the corresponding hyperfine fields of the 55 Mn nuclei. The frequency spacing between satellite lines is constant within a compound, but decreases with increasing Fe concentration x , which originates in changes in the band structure. These changes are also responsible for the altered resonance frequencies observed for the same third shell environment but corresponding to a different overall Fe concentration x . All modifications in the hyperfine field upon substitution of Mn by Fe can be uniquely assigned to an entirely random distribution of Mn and Fe limited to only one (4b ) out of four fcc sublattices constituting the L2 1 Heusler structure, demonstrating that the complete substitutional series Co 2 Mn 1-x Fe x Si is crystallographically very well defined. This very high degree of order sets the stage for the observation of stable half-metallic ferromagnetism which is typically very sensitive to the structural order.
Originele taal-2Engels
Artikelnummer134424
Pagina's (van-tot)134424-1/8
TijdschriftPhysical Review B
Volume88
Nummer van het tijdschrift13
DOI's
StatusGepubliceerd - 2013

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    Wurmehl, S., Alfonsov, A., Kohlhepp, J. T., Swagten, H. J. M., Koopmans, B., Wójcik, M., Balke, B., Ksenofontov, V., Blum, C. G. F., & Büchner, B. (2013). Mn-55 NMR study of quaternary half-metallic ferromagnetic Co2Mn1-xFexSi Heusler compounds. Physical Review B, 88(13), 134424-1/8. [134424]. https://doi.org/10.1103/PhysRevB.88.134424