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Title: Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys

Abstract

Magnetic Compton scattering, x-ray magnetic circular dichroism spectroscopy, and bulk magnetometry measurements are performed on a set of medium- (NiFeCo and NiFeCoCr) and high-entropy (NiFeCoCrPd and NiFeCoCrMn) Cantor-Wu alloys. The bulk spin momentum densities determined by magnetic Compton scattering are remarkably isotropic, and this is a consequence of the smearing of the electronic structure by disorder scattering of the electron quasiparticles. Nonzero x-ray magnetic circular dichroism signals are observed for every element in every alloy indicating differences in the populations of the majority and minority spin states implying finite magnetic moments. When Cr is included in the solid solution, the Cr spin moment is unambiguously antiparallel to the total magnetic moment, while a vanishingly small magnetic moment is observed for Mn, despite calculations indicating a large moment. Some significant discrepancies are observed between the experimental bulk and surface magnetic moments. Furthermore, despite the lack of quantitative agreement, the element-specific surface magnetic moments seem to be qualitatively reasonable.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3];  [4];  [4]; ORCiD logo [4];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5];  [3];  [6];  [7]; ORCiD logo [2]
  1. Univ. of Bristol (United Kingdom). H. H. Wills Physics Lab.; Cardiff Univ. (United Kingdom); Japan Synchrotron Radiation Research Inst., Sayo (Japan)
  2. Univ. of Bristol (United Kingdom). H. H. Wills Physics Lab.
  3. Univ. of Warwick, Coventry (United Kingdom)
  4. Japan Synchrotron Radiation Research Inst., Sayo (Japan)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. DMSC - European Spallation Source, Copenhagen (Denmark)
  7. Cardiff Univ. (United Kingdom)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Engineering and Physical Sciences Research Council (EPSRC)
OSTI Identifier:
1712704
Grant/Contract Number:  
AC05-00OR22725; EP/R029962/1; EP/L015544/1; EP/S016465/1
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 102; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnetism; disordered alloys; Compton scattering; Korringa-Kohn-Rostoker method; x-ray magnetic circular dichroism

Citation Formats

Billington, D., James, A. N., Harris-Lee, E. I., Lagos, D. A., O'Neill, D., Tsuda, N., Toyoki, K., Kotani, Y., Nakamura, T., Bei, H., Mu, S., Samolyuk, G. D., Stocks, G. M., Duffy, J. A., Taylor, J. W., Giblin, S. R., and Dugdale, S. B. Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys. United States: N. p., 2020. Web. doi:10.1103/physrevb.102.174405.
Billington, D., James, A. N., Harris-Lee, E. I., Lagos, D. A., O'Neill, D., Tsuda, N., Toyoki, K., Kotani, Y., Nakamura, T., Bei, H., Mu, S., Samolyuk, G. D., Stocks, G. M., Duffy, J. A., Taylor, J. W., Giblin, S. R., & Dugdale, S. B. Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys. United States. https://doi.org/10.1103/physrevb.102.174405
Billington, D., James, A. N., Harris-Lee, E. I., Lagos, D. A., O'Neill, D., Tsuda, N., Toyoki, K., Kotani, Y., Nakamura, T., Bei, H., Mu, S., Samolyuk, G. D., Stocks, G. M., Duffy, J. A., Taylor, J. W., Giblin, S. R., and Dugdale, S. B. Thu . "Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys". United States. https://doi.org/10.1103/physrevb.102.174405. https://www.osti.gov/servlets/purl/1712704.
@article{osti_1712704,
title = {Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys},
author = {Billington, D. and James, A. N. and Harris-Lee, E. I. and Lagos, D. A. and O'Neill, D. and Tsuda, N. and Toyoki, K. and Kotani, Y. and Nakamura, T. and Bei, H. and Mu, S. and Samolyuk, G. D. and Stocks, G. M. and Duffy, J. A. and Taylor, J. W. and Giblin, S. R. and Dugdale, S. B.},
abstractNote = {Magnetic Compton scattering, x-ray magnetic circular dichroism spectroscopy, and bulk magnetometry measurements are performed on a set of medium- (NiFeCo and NiFeCoCr) and high-entropy (NiFeCoCrPd and NiFeCoCrMn) Cantor-Wu alloys. The bulk spin momentum densities determined by magnetic Compton scattering are remarkably isotropic, and this is a consequence of the smearing of the electronic structure by disorder scattering of the electron quasiparticles. Nonzero x-ray magnetic circular dichroism signals are observed for every element in every alloy indicating differences in the populations of the majority and minority spin states implying finite magnetic moments. When Cr is included in the solid solution, the Cr spin moment is unambiguously antiparallel to the total magnetic moment, while a vanishingly small magnetic moment is observed for Mn, despite calculations indicating a large moment. Some significant discrepancies are observed between the experimental bulk and surface magnetic moments. Furthermore, despite the lack of quantitative agreement, the element-specific surface magnetic moments seem to be qualitatively reasonable.},
doi = {10.1103/physrevb.102.174405},
journal = {Physical Review B},
number = 17,
volume = 102,
place = {United States},
year = {Thu Nov 05 00:00:00 EST 2020},
month = {Thu Nov 05 00:00:00 EST 2020}
}

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