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- W2015616613 abstract "Despite the research devoted to new compounds, the Sm-Co-Cu-Fe-Zr alloys with the 2:17 type are, as yet, the only hard magnets to be used above 200 °C. However, these materials are not optimized because their coercivity mechanism is not clearly understood. Their typical microstructure consists of a network of 2:17 cells separated by 1:5 boundaries. Their coercivity is ascribed to the domain wall pinning by the 1:5 cell boundaries. The compositions of the 1:5, 2:17 phases during the cell microstructure genesis were recently evaluated for the alloy Sm(Co0.66Fe0.25Cu0.06Zr0.03)7.6. In the present work, the coercivity behavior of this alloy is analyzed from the comparison of the domain wall energies γ 1:5, γ 2:17. Sintered samples, heat-treated in various conditions, are characterized by transmission electron microscopy and hysteresis curves. γ 2:17 and γ 1:5 are calculated from measured and published data of magnetization and anisotropy. The different treatments generate similar cell microstructures but two ranges of coercivity (about 600 and 2200 K A m−1). In the two cases, γ 1:5 is larger than γ 2:17: the cell boundaries appear as repelling energy barriers rather than pinning sites. The existence of a disturbed anisotropy layer along the 1:5/2:17 interface is proposed to explain the higher coercivity state. The evaluation of Hc using the usual models is attempted." @default.
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- W2015616613 date "1994-05-15" @default.
- W2015616613 modified "2023-09-24" @default.
- W2015616613 title "Coercivity in hard magnets based on Sm<sub>2</sub>Co<sub>17</sub>(abstract)" @default.
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- W2015616613 doi "https://doi.org/10.1063/1.356887" @default.
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