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High-temperature AC magnetic properties for (Fe0.5Co0.5)73.5Cu1Nb3Si13.5B9 alloy annealed at various temperatures have been investigated using an impedance analyzer. Annealing temperature Ta has obvious effects on high-temperature AC magnetic properties of the alloy. The Hopkinson peak appears only in the amorphous alloy when Ta ≤ 703K. As Ta increases above 733K, the real part of the complex initial permeability μi' descends gradually, μi' decreases more slowly with temperature in the high temperature range. The high-temperature (about 750K) AC initial permeability for the alloy annealed at Ta=763K has been found to maintain a stable high value of 950 up to a frequency of ~ 1 × 105Hz. Partial substitution of Co for Fe in the Fe73.5Cu1Nb3Si13.5B9 alloy leads to an increase of around 110K of the Curie temperature of the amorphous phase, much higher than Ge-containing Finemet alloy.
High-temperature AC magnetic properties for (Fe 0.5 Co 0.5) 73.5 Cu 1 Nb 3 Si 13.5 B 9 alloy annealed at various temperatures have been investigated using an impedance analyzer. Annealing temperature Ta has obvious effects on high-temperature AC magnetic properties of the alloy. The Hopkinson As Ta increases above 733K, the real part of the complex initial permeability μi 'descends gradually, μi' decreases more slowly with temperature in the high temperature range. The high-temperature (about 750K) AC initial permeability for the alloy annealed at Ta = 763K has been found to maintain a stable high value of 950 up to a frequency of ~1 × 105Hz. Partial substitution of Co for Fe in the Fe73.5Cu1Nb3Si13.5B9 alloy leads to an increase of around 110K of the Curie temperature of the amorphous phase, much higher than Ge-containing Finemet alloy.