Magnetostriction of Tb Single Crystals

Abstract

The magnetostriction of Tb single crystals has been measured from 4 to 350\ifmmode^\circ\else\textdegree\fi{}K in applied fields up to 30 kOe by strain-gage methods. The temperature dependence of the four magnetostriction constants has been determined under the assumption that the magnetic moment remains in the basal plane. Two of the constants were evaluated by strain measurements as a function of applied-field direction in the basal plane, and the remaining two by isofield magnetostrain measurements and subtraction of the thermal strain extrapolated from the paramagnetic region. The theoretical dependence of the anisotropic basal plane constants on the magnetic moment has been evaluated.