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.
Billington, D., et al. "Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys." Physical Review B, vol. 102, no. 17, Nov. 2020. 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., & Dugdale, S. B. (2020). Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys. Physical Review B, 102(17). https://doi.org/10.1103/physrevb.102.174405
Billington, D., James, A. N., Harris-Lee, E. I., et al., "Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys," Physical Review B 102, no. 17 (2020), https://doi.org/10.1103/physrevb.102.174405
@article{osti_1712704,
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 others},
title = {Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys},
annote = {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},
url = {https://www.osti.gov/biblio/1712704},
journal = {Physical Review B},
issn = {ISSN 2469-9950},
number = {17},
volume = {102},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2020},
month = {11}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 498, Issue 1-3https://doi.org/10.1016/S0168-9002(02)02145-9
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 401, Issue 2-3https://doi.org/10.1016/S0168-9002(97)01066-8
PROCEEDINGS OF THE 12TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION – SRI2015, AIP Conference Proceedingshttps://doi.org/10.1063/1.4952867