Magnetic interactions and spin-wave stiffness constant of In-substituted yttrium iron garnets
Magnetic interactions and spin-wave stiffness constant of In-substituted yttrium iron garnets
Magnetization and Curie temperature of the samples were measured with the SQUID and VSM equipments. The non-magnetic indium ions were found to reside at the octahedral sites, leading to an increase of the total magnetization and a decrease in the Curie temperature. Molecular field coefficients Naa, Ndd and Nad were determined by fitting the experimental thermomagnetization curves in the framework of a two-sublattice ferrimagnetic model.