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Effects of the electron doping on the magnetic and electronic properties have been investigated in the conducting double perovskite Sr 2 FeMoO 6 . Judging from the enhanced moment Mo at the Mo site, the doped electrons are considered to occupy mainly the down-spin Mo4d band. Filling dependence of the saturation magnetization M s , the spin-wave stiffness coefficient D s and the ␥ coefficient are discussed on the basis of a LDAϩU band calculation. We further discuss possible origins for the magnetism.