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Mechanism of Improved High-Temperature Magnetic Softness for Co-Contained Finemet Alloy

Temperature dependence of initial permeability μi for Co-contained Finemet-type alloy annealed at 500 °C through 600 °C was measured for observing the changes of μi at elevated temperature. It was found that the μi of 600 °C-annealed sample did not drop dramatically at the Curie temperature of the amorphous phase, which is a new magnetic phenomenon observed only in two-phase nanocrystalline alloys. The origin of the phenomenon has been analyzed by estimating the Curie temperature of as-quenched amorphous alloy, TcA*, which has the same composition with the residual amorphous phase in annealed nanocrystalline alloy, as well as the Curie temperature of the intergranular amorphous region TcA. The results indicated that TcA* did not enhance after nanocrystallization; however, TcA can be elevated drastically up to the Curie temperature of crystalline phase Tccry when the exchange field between adjacent nanograins penetrated the amorphous interphase thoroughly. In addition, the effective exchange penetration length of Co-contained Finemet alloy LFeCo was also evaluated, which is larger than that of Finemet alloys. This should be the main mechanism of improved high-temperature magnetic softness for Co-contained Finemet alloys.