Abstract
Magentostriction measurements in highly-oriented ribbons of (Er1-xTbx)2Fe14B with 0≤x≤0.45, fabricated by a rapid-quenching method have been performed in order to investigate the lattice deformation at the spin reorientation (SR) transitions. The c-axis of the tetragonal cell was found to be aligned perpendicular to the ribbon surface. The sum of the longitudinal and transverse magnetostriction λ//+λ⊥, with fields applied within the ribbon plane, took a maximum at successive SR temperatures. A model calculation of the volume change ΔV/V was made by assuming that only the crystalline electric field (CEF) potentials at Er and Tb sites affect the volume change. This calculation showed that ΔV/V exhibits a sharp peak at SR temperatures, which is in accordance with the experimental peaks of λ//+λ⊥.
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