Magnetization and magnetostriction processes in Tb(0.27−0.30)Dy(0.73−0.70)Fe(1.9−2.0)

The present analysis provides ${\mathrm{Tb}}_{\text{(0.27−0.30)}}{\mathrm{Dy}}_{\text{(0.73−0.70)}}{\mathrm{Fe}}_{\text{(1.9−2.0)}}$ magnetization and magnetostriction states during applied magnetic field and stress processes by minimizing the total magnetic free energy in the presence of a parameter selected inverse exponential magnetic free energy distribution. A comparison between experimental and model results shows that the model provides a qualitatively accurate description of the magnetostriction and magnetization in ${\mathrm{Tb}}_{\text{(0.27−0.30)}}{\mathrm{Dy}}_{\text{(0.73−0.70)}}{\mathrm{Fe}}_{\text{(1.9−2.0)}}$ during applied magnetic field processes for a range of constant uniaxial applied stresses. Therefore, the model appears to be a useful tool for the analysis of ${\mathrm{Tb}}_{\text{(0.27−0.30)}}{\mathrm{Dy}}_{\text{(0.73−0.70)}}{\mathrm{Fe}}_{\text{(1.9−2.0)}}$ applications with constant stress or strain dependent stress states. Furthermore, the good qualitative agreement between model and experiment supports the contention that the magnetostriction and magnetization response of ${\mathrm{Tb}}_{\text{(0.27−0.30)}}{\mathrm{Dy}}_{\text{(0.73−0.70)}}{\mathrm{Fe}}_{\text{(1.9−2.0)}}$ is influenced by a defect induced defocusing of local magnetization direction about the average magnetization direction.