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We predict through our first-principles calculations that four doubleperovskite oxides of Bi2ABO6 (AB = FeMo, MnMo, MnOs, CrOs) are half-metallicferrimagnets. Our calculated results shows that the four optimized structureshave negative formation energy, from -0.42 to -0.26 eV per formula unit, whichimplies that they could probably be realized. In the case of Bi2FeMoO6, thehalf-metallic gap and Curie temperature are predicted to reach to 0.71 eV and650 K, respectively, which indicates that high spin polarization could be keptat high temperatures far beyond room temperature. It is believed that some ofthem could be synthesized soon and would prove useful for spintronicapplications.

Promising ferrimagnetic double perovskite oxides towards high spin polarization at high temperature