Structure and Temperature Dependence of Magnetic Properties in the Nanocrystalline Fe74SixB22-xCu1Nb3 Alloys

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Abstract
We have examined the structure and magnetic properties in terms of the temperature dependence of magnetic permeability and magnetization for the Fe74Si x B22- x Cu1Nb3 (x=8-18) alloys. The temperature dependence of the permeability of the alloys shows various characteristic behaviors depending on the alloy composition (x=8-18) and annealing temperature (450-630° C). The permeability of the samples having coexisting α-Fe(Si) and amorphous phases decreases abruptly near the Curie temperature of the amorphous materials, while the permeability of the samples containing precipitated Fe-B compounds is not appreciably affected by the magnetism in the residual amorphous region. The precipitation of Fe-B compound depends on the composition of the mother alloys. The Fe-B compounds precipitated in the amorphous region upon annealing at high temperature are mainly Fe23B6 for x=14, Fe3B for x=18, and Fe2B for the composition x less than 12.