Magnetostriction and anisotropy compensation in Tb_(x)Dy_(1-x)Pr_(0.3)(Fe_(0.9)B_(0.1))_(1.93) alloys

摘要

Structure and magnetostriction of Dy_(0.7-x)Tb_(x)Pr_(0.3)(Fe_(0.9)B_(0.1))_(1.93) (0≤x≤0.70) alloys have been studied. The easy magnetization direction of the Laves phase in the Dy_(0.7-x)Tb_(x)Pr_(0.3)(Fe_(0.9)B_(0.1))_(1.93) alloys with 0≤x<0.20 lies along 〈100〉 axis, while that of the Laves phase in those alloys with 0.25≤x≤0.70 lies along 〈111〉 axis, as determined by means of x-ray crystallography study. When x is increased from 0.15 to 0.25, the change of the easy magnetization direction from 〈100〉 to 〈111〉 axis is detected also by Mossbauer spectra, in good agreement with the results of x-ray crystallography. The Laves phase Tb_(0.25)Dy_(0.45)Pr_(0.3)(Fe_(0.9)B_(0.1))_(1.93) has a large spontaneous magnetostriction (λ_(111)≈1850 ppm) and a low anisotropy at room temperature, which could make it a good candidate material for magnetostriction applications.