Abstract
The phase formation and magnetic properties of melt-spun Sm2Fe15Ga2Cx ribbons with a Zr addition of 1.5 at. % have been investigated. A metastable phase with the disordered TbCu7-type structure is formed in the samples annealed at temperatures between 620 and 740 °C. Upon heating above 750 °C, a structural transformation from the hexagonal TbCu7- to the rhombohedral Th2Zn17-type structure occurs. It was found that the Zr addition improves the thermal stability of the TbCu7 structure. Transmission electron microscopy observations show that the grain sizes in 1:7-type ribbons are much smaller than that in 2:17-type samples. The highest value of the maximum energy product of 88.7 kJ/m3 is obtained in a 1:7-type ribbon annealed at 740 °C for 15 min. The corresponding remanence and coercivity amounts to 0.8 and 0.43 T, respectively. In contrast, coercivities higher than 0.8 T obtained in 2:17-type ribbons are accompanied by remanences lower than 0.66 T. The 1:7-type ribbons with grain sizes in the range of 15–45 nm show significant remanence enhancement which can be attributed to the exchange coupling between adjacent grains.
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