Abstract
We present a theoretical study of magnetic properties of metallic double perovskite ferrimagnets such as Sr 2FeMoO 6 and Sr 2FeReO 6. The analysis is based on the Kondo-type Hamiltonian in which charge carriers are constrained to be antiparallel to Fe local moments with spin S. The spectrum of spin wave excitations is derived based on the model Hamiltonian within the 1/ S expansion. The ground state phase diagram as a function of carrier density is also discussed.
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