Controlled growth and magnetic property of fept nanostructure: cuboctahedron, octapod, truncated cube, and cube

The strategy for shape control of alloy FePt nanocrystal was studied systematically. By the careful adjustments of reaction parameters in a solution reaction, surfactant-facet bindings on the growth seed were controlled delicately. FePt octapod, cuboctahedron, truncated cube, and nanocube were successfully prepared from, cuboctahedral seed and examined by high-resolution transmission electron microscopy. The formations of FePt nanostructures were mainly attributed to the differences in the growth rate between the {111} and {100} planes of cuboctahedral seeds. The magnetic measurements showed, that the order of volume, V_(nanocube) > V_(octapod) > V _{(cuboctahedron)} obviously reflected the order of saturated magnetization (M_s), M_{s (nanocube)} > M _{s (cuboctahedron)} > M_{s (cuboctahedron)}. Furthermore, the measurements of octapod exhibited the highest coercivity and blocking temperature because of its higher surface to volume ratio and more structural facets