Abstract
Highly ordered TbxFe7Co3 (x = 0, 0.6, 0.8) nanowires were synthesized in alumina templates by electrochemical deposition method. Here, the effects of Tb content and annealing treatment on the phase composition, morphology, crystalline structure and magnetic properties were investigated. The as-deposited Tb0Fe7Co3 nanowires comprise Fe7Co3 phase. While after adding Tb, the diffraction peaks slightly shift left, indicating the infiltration of Tb atoms into Fe7Co3 phase. After annealing, Tb0Fe7Co3 nanowires still consist of Fe7Co3 phase with a slight enhancement on coercivity. While the annealed nanowires with Tb doped present a complex phase composition containing Fe3Tb, Fe2Tb, Co3Tb, Co17Tb2, TbFeO3 and Fe2O3 phases distribute in the central portion, and Co0.72Fe0.28 at the nanowire outer walls. The annealed TbxFe7Co3 (x = 0.6, 0.8) nanowires show higher magnetic performance owing to the formation of hard magnetic phases, the interfacial elastic coupling between hard and soft phases and the coherent Fe3Tb/Co3Tb interface which restrain the domain wall motion. To be specific, the coercivity and remanence ratio of TbxFe7Co3 (x = 0.6, 0.8) nanowires significantly enhance with increasing Tb content.
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