Abstract
Highly anisotropic SmCo5 single crystal particles are promising candidates for high-density data storage and building nanocomposite permanent magnets with large maximum energy product. Previously, nanocrystalline SmCo5 particles obtained by calciothermic reduction exhibit low magnetic energy product due to magnetic isotropy caused by severely agglomerated equiaxial particles. In this study, we report a new strategy to fabricate highly anisotropic SmCo5 nanochips by reductive annealing of precursors with a special designed morphology. The precursors containing single crystal Co(OH)2 nanoflakes and crystalline Sm(OH)3 nanorods were synthesized by a hydrothermal process, and converted into SmCo5 nanochips by subsequent thermal reduction, during which the Co(OH)2 nanoflakes facilitate the formation of SmCo5 nanochips as a template and Sm(OH)3 nanorods help to maintain the hexagonal morphology and single crystal nature. The SmCo5 nanochips exhibit strong magnetic anisotropy and excellent room temperature magnetic properties with a remanence of 7.7 kG, coercivity of 19.3 kOe, and maximum energy product of 14.4 MGOe, which is the highest recorded value for chemical synthesized nanostructured SmCo5 particles.
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