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  Influence of nanoscale order-disorder transitions on the magnetic properties of Heusler compounds for spintronics

Karel, J., Fischer, J. E., Fabbrici, S., Pippel, E., Werner, P., Vinicius Castergnaro, M., et al. (2017). Influence of nanoscale order-disorder transitions on the magnetic properties of Heusler compounds for spintronics. Journal of Materials Chemistry C, 5(18), 4388-4392. doi:10.1039/c7tc01241a.

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Karel, J.1, Autor           
Fischer, J. E.2, Autor           
Fabbrici, S.3, Autor
Pippel, E.3, Autor
Werner, P.3, Autor
Vinicius Castergnaro, M.3, Autor
Adler, P.4, Autor           
Ouardi, S.5, Autor           
Balke, B.3, Autor
Fecher, G. H.6, Autor           
Morais, J.3, Autor
Albertini, F.3, Autor
Parkin, S. S. P.3, Autor
Felser, C.7, Autor           
Affiliations:
1Julie Karel, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863434              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3External Organizations, ou_persistent22              
4Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863435              
5Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863439              
6Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
7Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Zusammenfassung: Modifications in nanoscale chemical order are used to tune the magnetic properties, namely T-C, of Co2FeSixAl1-x (0 < x < 1). High-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) with Z-contrast reveals nanoscale regions of L2(1) order within a B2 matrix in the off-stoichiometry samples. Perhaps surprisingly, the latter, more chemically disordered structure, exhibits a higher T-C. Upon annealing, the off-stoichiometry samples become more homogeneous with the fraction of L2(1) order decreasing. The short-range order was also investigated using X-ray absorption fine structure (XAFS) measurements at the Co and Fe K edges. Since the local atomic environments of Co atoms in the L2(1) and B2 structures are identical, the features presented in the Co K edge XAFS data are the same in both cases. By contrast, the L2(1) and B2 structures exhibit different signatures at the Fe K edge owing to the different chemical environments. Fitting of these spectra confirms the nanoscale chemical disorder observed by HAADF-STEM and the expected role this disorder plays on T-C. Our results point to a methodology that might be extended to modify the magnetic and electronic properties of any Heusler compound; chemical disorder can be an engineering tool to realize highly tailored properties.

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Sprache(n): eng - English
 Datum: 2017-04-202017-04-20
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000401103000005
DOI: 10.1039/c7tc01241a
 Art des Abschluß: -

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Titel: Journal of Materials Chemistry C
  Andere : Journal of Materials Chemistry C: Materials for Optical and Electronic Devices
  Kurztitel : J. Mater. Chem. C
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: London, UK : Royal Society of Chemistry
Seiten: - Band / Heft: 5 (18) Artikelnummer: - Start- / Endseite: 4388 - 4392 Identifikator: ISSN: 2050-7526
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7526