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- W2962734276 abstract "Structural and magnetic properties of iron-free and iron-substituted $mathrm{SmC}{mathrm{o}}_{5}$ have been investigated theoretically and experimentally. The nanocrystalline ribbons of ${mathrm{SmCo}}_{5ensuremath{-}x}{mathrm{Fe}}_{x}phantom{rule{4pt}{0ex}}(0ensuremath{le}xensuremath{le}2)$, which were produced by rapid solidification, crystallize in the hexagonal $mathrm{CaC}{mathrm{u}}_{5}$ structure for $xensuremath{le}0.75$. Small Fe additions $(x=0.25)$ substantially improve the coercivity, from 0.45 to 2.70 T, which we interpret as combined intrinsic and extrinsic effect. Most of our findings are consistent with past samarium-cobalt research, but some are at odds with findings that have seemingly been well established through decades of rare-earth transition-metal research. In particular, our local spin-density approximation with Hubbard parameter calculations indicate that the electronic structure of the Sm atoms violates Hund's rules and that the orbital moment is strongly quenched. Possible reasons for the apparent disagreement between theory and experiment are discussed. We explicitly determine the dependence of the Sm $4f$ charge distribution, arguing that an accurate density-functional description of $mathrm{SmC}{mathrm{o}}_{5}$ is a challenge to future research." @default.
- W2962734276 created "2019-07-30" @default.
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- W2962734276 date "2019-07-18" @default.
- W2962734276 modified "2023-10-16" @default.
- W2962734276 title "Anisotropy and orbital moment in Sm-Co permanent magnets" @default.
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- W2962734276 doi "https://doi.org/10.1103/physrevb.100.024419" @default.
- W2962734276 hasPublicationYear "2019" @default.
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