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Low temperature polarized neutron reflectometry measurements are presented, exploring the evolution of ferrimagnetism in thin GdTiO 3 films embedded within a SrTiO 3 matrix. In GdTiO 3 films thinner than∼ 4 nm, the TiO 6 octahedral tilts endemic to GdTiO 3 coherently relax toward the undistorted, cubic phase of SrTiO 3. Our measurements indicate that the ferrimagnetic state within the GdTiO 3 layers survives as these TiO 6 octahedral tilts are suppressed. Furthermore, our data suggest that layers of suppressed magnetization (ie, magnetic dead layers) develop within the GdTiO 3 layer at each GdTiO 3/SrTiO 3 interface and explain the apparent magnetization suppression observed in thin GdTiO 3 films when using volume-averaged techniques. Our data show that the low temperature magnetic moment inherent to the core GdTiO 3 layers is only weakly impacted as the octahedral tilt angles are suppressed by …