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Arévalo-López AM, McNally GM, Attfield JP. Large magnetization and frustration switching of magnetoresistance in the double-perovskite ferrimagnet Mn2FeReO6. Angew Chem Int Ed Engl. 2015;54(41):12074-7doi: 10.1002/anie.201506540.
Arévalo-López, A. M., McNally, G. M., & Attfield, J. P. (2015). Large magnetization and frustration switching of magnetoresistance in the double-perovskite ferrimagnet Mn2FeReO6. Angewandte Chemie (International ed. in English), 54(41), 12074-7. https://doi.org/10.1002/anie.201506540
Arévalo-López, Angel M, et al. "Large magnetization and frustration switching of magnetoresistance in the double-perovskite ferrimagnet Mn2FeReO6." Angewandte Chemie (International ed. in English) vol. 54,41 (2015): 12074-7. doi: https://doi.org/10.1002/anie.201506540
Arévalo-López AM, McNally GM, Attfield JP. Large magnetization and frustration switching of magnetoresistance in the double-perovskite ferrimagnet Mn2FeReO6. Angew Chem Int Ed Engl. 2015 Oct 05;54(41):12074-7. doi: 10.1002/anie.201506540. Epub 2015 Aug 26. PMID: 26307014.
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Angew Chem Int Ed Engl. 2015 Oct 05;54(41):12074-7. doi: 10.1002/anie.201506540. Epub 2015 Aug 26.

Large magnetization and frustration switching of magnetoresistance in the double-perovskite ferrimagnet Mn2FeReO6.

Angewandte Chemie (International ed. in English)

Angel M Arévalo-López, Graham M McNally, J Paul Attfield

Affiliations

  1. Centre for Science at Extreme Conditions (CSEC) and School of Chemistry, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ (UK).
  2. Centre for Science at Extreme Conditions (CSEC) and School of Chemistry, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ (UK). [email protected].

PMID: 26307014 DOI: 10.1002/anie.201506540

Abstract

Ferrimagnetic A2 BB'O6 double perovskites, such as Sr2 FeMoO6 , 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, Mn2 FeReO6 , 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 Mn(2+) spin ordering which cants Fe(3+) and Re(5+) spins and reduces spin-polarization. Ferrimagnetic double perovskites based on A-site Mn(2+) thus offer new opportunities to enhance magnetization and control magnetoresistance in spintronic materials.

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: ferrimagnetic double perovskites; high-pressure chemistry; magnetic properties; magnetoresistance; perovskite phases

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