Investigation of the Nanocrystallization Process and the Magnetic Properties of Finemet-Like Fe73.5Si17.5B5Nb3Cu1 Ribbons

Investigation of the Nanocrystallization Process and the Magnetic Properties of Finemet-Like Fe73.5Si17.5B5Nb3Cu1 Ribbons

The crystalization evolution and the soft magnetic properties of a a Finemet-like nanocomposite ribbon, Fe7₃.5Si₁7.5B5Nb₃Cu₁, have been investigated by using differential scanning calorimetry (DSC) and thermomagnetic measurements. The results show that DSC curve exhibits two clearly exothermal peaks, one at 535 ℃ and the other at 670 ℃, which are related to crystalization of the α-Fe(Si) and the boride phases, respectively. The crystalization activation energy is evaluated by using two models, the Kissinger model and the Johnson-Mehl-Avrami (JMA) model, which are consistent with each other. Ultrasoft magnetic properties are obtained after proper annealing due to the formation of an appropriate volume fraction of nanostructured α-Fe(Si) embedded in a residual amorphous matrix to compensate the total magnetostriction. The in uence of the annealing process on the soft magnetic properties of the studied sample was investigated and is discussed.

The crystalization evolution and the soft magnetic properties of a a Finemet-like nanocomposite ribbon, Fe7₃.5Si₁7.5B5Nb₃Cu₁, have been investigated by using differential scanning calorimetry (DSC) and thermomagnetic measurements. The results show that DSC curve exhibits two clearly exothermal peaks, one at 535 ℃ and the other at 670 ℃, which are related to crystalization of the α-Fe(Si) and the boride phases, respectively. The crystalization activation energy is evaluated by using two models, the Kissinger model and the Johnson-Mehl-Avrami (JMA) model, which are consistent with each other. Ultrasoft magnetic properties are obtained after proper annealing due to the formation of an appropriate volume fraction of nanostructured α-Fe(Si) embedded in a residual amorphous matrix to compensate the total magnetostriction. The in uence of the annealing process on the soft magnetic properties of the studied sample was investigated and is discussed.