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Arévalo-López, Angel M.; McNally, Graham M.; Attfield, J. Paul
Angewandte Chemie (International ed.), October 5, 2015, Volume: 54, Issue: 41Journal Article
Ferrimagnetic A2BB′O6 double perovskites, such as Sr2FeMoO6, are important spin‐polarized conductors. Introducing transition metals at the A‐sites offers new possibilities to increase magnetization and tune magnetoresistance. Herein we report a ferrimagnetic double perovskite, Mn2FeReO6, synthesized at high pressure which has a high Curie temperature of 520 K and magnetizations of up to 5.0 μB which greatly exceed those for other double perovskite ferrimagnets. A novel switching transition is discovered at 75 K where magnetoresistance changes from conventional negative tunneling behavior to large positive values, up to 265 % at 7 T and 20 K. Neutron diffraction shows that the switch is driven by magnetic frustration from antiferromagnetic Mn2+ spin ordering which cants Fe3+ and Re5+ spins and reduces spin‐polarization. Ferrimagnetic double perovskites based on A‐site Mn2+ thus offer new opportunities to enhance magnetization and control magnetoresistance in spintronic materials. Double‐perovskite magnetism: The double perovskite Mn2FeReO6 synthesized at high pressure has magnetic transition‐metal cations at all sites. High‐spin Mn2+ cations lead to record magnetizations for double‐perovskite ferrimagnets and their frustrated magnetic order at 75 K switches magnetoresistance from negative to large positive values at low temperatures.
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