The magnetization,geffand linewidth &Dgr;H∥and &Dgr;H⊥for liquid‐phase‐epitaxially grown thin films of EuxY3−xFe5−yGayO12(0.2≤x≤1.2;y=1.0) have been investigated in the temperature range 85–420 K. &Dgr;Hversus temperature curves show maxima which occur at about the same temperature as that observed in bulk single crystals of EuIG, but the width of the curves is narrower in the LPE films. The temperature and composition dependence ofgeffand &Dgr;Hhave been explained on the basis of the three sublattice model and a new relaxation mechanism based on anisotropic exchange.