d="p0005">A method is proposed for estimating the direct magnetostriction from the reversible Villari effect.
dd><dt class="label">•dt><dd>d="p0010">The method operates at extremely low magnetic fields (e.g. the Earth's magnetic field).
dd><dt class="label">•dt><dd>d="p0015">The temperature and field dependences of the direct magnetostriction agree with data available.
dd>dl>