Magnetostriction observed by X-ray diffraction in iron

A new technique to observe magnetostriction by X-ray diffraction was reported. We found that a symmetry part of the relative diffraction intensity change induced by applying magnetic field was proportional to a Bragg angle shift. It was a differential measurement on the rocking curve. The Bragg angle and its shift gave quantitative magnetostrictive coefficients. Sensitivity of the present method on the magnetostrictive coefficient for an iron specimen approached to 10/sup -7/.