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Multiferroic materials, in which ferroelectric and magnetic ordering coexist,are of fundamental interest for the development of novel memory devices thatallow for electrical writing and non-destructive magnetic readout operation.The great challenge is to create room temperature multiferroic materials withstrongly coupled ferroelectric and ferromagnetic (or ferrimagnetic) orderings.BiFeO3 has been the most heavily investigated single-phase multiferroic to datedue to the coexistence of its magnetic order and ferroelectric order at roomtemperature. However, there is no net magnetic moment in the cycloidal(antiferromagnetic-like) magnetic state of bulk BiFeO3, which severely limitsits realistic applications in electric field controlled spintronic devices.Here, we predict that double perovskite Zn2FeOsO6 is a new multiferroic withproperties superior to BiFeO3. First, there are strong ferroelectricity andstrong ferrimagnetism at room temperature in Zn2FeOsO6. Second, the easy-planeof the spontaneous magnetization can be switched by an external electric field,evidencing the strong magnetoelectric coupling existing in this system. Ourresults suggest that ferrimagnetic 3d-5d double perovskite may therefore beused to achieve voltage control of magnetism in future spintronic devices.

Predicting a Ferrimagnetic Phase of Zn2FeOsO6 with Strong Magnetoelectric Coupling