Bulk and element specific magnetism of the medium 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 (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. Non-zero 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.

References in corpus (4)

• Verification of Short-Range Order and Its Impact on the Properties of the CrCoNi Medium Entropy Alloy
• Extreme Fermi surface smearing in a maximally disordered concentrated solid solution
• Momentum space anisotropy of electronic correlations in Fe and Ni - an analysis of magnetic Compton profiles
• Static corrections versus dynamic correlation effects in the valence band Compton profile spectra of Ni

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• Compositional phase stability in medium-entropy and high-entropy Cantor-Wu alloys from an ab initio all-electron, Landau-type theory and atomistic modelling
• Structure, short-range order, and phase stability of the Al${}_x$CrFeCoNi high-entropy alloy: Insights from a perturbative, DFT-based analysis
• Competition between phase ordering and phase segregation in the Ti${}_x$NbMoTaW and Ti${}_x$VNbMoTaW refractory high-entropy alloys
• Magnetic properties of equiatomic CrMnFeCoNi
• Magnetic Compton profiles of Ni beyond the one-particle picture: numerically exact and perturbative solvers of dynamical mean-field theory
• Fast \textit{ab initio} design of high-entropy magnetic thin films
• Emergent B2 chemical orderings in the AlTiVNb and AlTiCrMo refractory high-entropy superalloys studied via first-principles theory and atomistic modelling