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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-5846-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-D40D-5
Genre: Journal Article

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 Creators:
Karel, J.1, Author              
Fischer, J. E.2, Author              
Fabbrici, S.3, Author
Pippel, E.3, Author
Werner, P.3, Author
Vinicius Castergnaro, M.3, Author
Adler, P.4, Author              
Ouardi, S.5, Author              
Balke, B.3, Author
Fecher, G. H.6, Author              
Morais, J.3, Author
Albertini, F.3, Author
Parkin, S. S. P.3, Author
Felser, C.7, Author              
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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 Abstract: 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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Language(s): eng - English
 Dates: 2017-04-202017-04-20
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000401103000005
DOI: 10.1039/c7tc01241a
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Title: Journal of Materials Chemistry C
  Other : Journal of Materials Chemistry C: Materials for Optical and Electronic Devices
  Abbreviation : J. Mater. Chem. C
Source Genre: Journal
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Publ. Info: London, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 5 (18) Sequence Number: - Start / End Page: 4388 - 4392 Identifier: ISSN: 2050-7526
CoNE: /journals/resource/2050-7526