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A two-sublattice ferrimagnet undergoes a transition from a collinear tocanted magnetic phase at magnetic field oriented along an easy magnetizationdirection. In this work, we study the transition by means of themagneto-optical Faraday effect in a thin film of compensated iron garnet(Lu$_{3-{\rm{x}}}$Bi$_{\rm{x}}$)(Fe$_{5-{\rm{y}}-{\rm{z}}}$Ga$_{\rm{y}}$Al$_{\rm{z}}$)O$_{12}$grown on Gd$_3$Ga$_5$O$_{12}$ substrate. In the immediate vicinity of thecompensation temperature a precursor of the transition with a complex shape wasobserved. Using a special sample with variable thickness we demonstrate aninterfacial origin of the precursor. Diffusion of gadolinium from the substrateinto the film forms a thin intermixed layer with enhanced magnetization. Itinduces an extended inhomogeneous magnetic structure in the film. A two-stepshape of the precursor appears due to an easy-plane anisotropy of theintermixed magnetic layer. We emphasize that an effective width of theinhomogeneous magnetization distribution in the film grows enormously whileapproaching the compensation temperature.

Giant widening of interface magnetic layer in almost compensated iron garnet