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

David P Billington*, Alyn D N James, Eddie I Harris-Lee, Daniel A Lagos, Daniel O'Neill, N. Tsuda, K. Toyoki, Y. Kotani, T. Nakamura, Hongbin Bei, Sai Mu, German Samolyuk, GM Stocks, Jonathan Duffy, Jonathan Taylor, Sean Giblin, Stephen B Dugdale

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

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 (NiFeCoCrPd and NiFeCoCrMn) entropy 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. Despite the lack of quantitative agreement, the element specific surface magnetic moments seem to be qualitatively reasonable.
Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Publication statusAccepted/In press - 13 Oct 2020

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    Billington, D. P., James, A. D. 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., Stocks, GM., Duffy, J., Taylor, J., Giblin, S., & Dugdale, S. B. (Accepted/In press). Bulk and element specific magnetism of the medium and high entropy Cantor-Wu alloys. Physical Review B - Condensed Matter and Materials Physics.