Nuclear magnetic relaxation in YIG films with nonmagnetic trivalent substitutions

Abstract Effect of cation substitutions on the nuclear magnetic relaxation of 57 Fe was measured in epitaxial films of Y 3 Fe 5− x Al x O 12 ( x =0.004–0.17), Y 3 Fe 5− x In x O 12 (0.002–0.24) and Y 3− x La x Fe 5 O 12 (0.001–0.04). Measurements were carried out in zero external magnetic field at 4.2 K. Decrease of the spin–lattice and the spin–spin (except for the In substitutions above x ∼0.05) relaxation rates with increased concentration was found.