Saturation Magnetostriction of Single-Crystal YIG

The magnetostriction of single-crystal yttrium iron garnet (YIG) has been measured from liquid nitrogen temperature to 450°K. The theory of magnetostriction of cubic crystals has also been extended to Néel ferrimagnets. The theoretical predictions of the temperature-dependent magnetostriction coefficients h1 and h2 are in excellent agreement with the measured values of −h1, which has a maximum (2.1×10−6) near room temperature, and of −h2, which falls monotonically with rising temperature (7.7×10−6 at 100°K and 4.2×10−6 at 300°K).