Abstract
A photoinduced decrease in permeability at 77 K was investigated for the polycrystalline mixed garnets of (Y1−xRx)3Fe5O12 with 0⩽x⩽1 and R=Eu, Yb, Ho, Tm, Gd, Tb, and Er. The change of the effect is interpreted as simply due to the change in the magnetocrystalline anisotropy of the host material.