A half-metallic A- and B-site-ordered quadruple perovskite oxide CaCu3Fe2Re2O12 with large magnetization and a high transition temperature

Wei-tin Chen, Masaichiro Mizumaki, Hayato Seki, Mark S. Senn, Takashi Saito, Daisuke Kan, J. Paul Attfield and Yuichi Shimakawa ()
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Wei-tin Chen: Institute for Chemical Research, Kyoto University
Masaichiro Mizumaki: Japan Synchrotron Radiation Research Institute, SPring-8
Hayato Seki: Institute for Chemical Research, Kyoto University
Mark S. Senn: Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh
Takashi Saito: Institute for Chemical Research, Kyoto University
Daisuke Kan: Institute for Chemical Research, Kyoto University
J. Paul Attfield: Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh
Yuichi Shimakawa: Institute for Chemical Research, Kyoto University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Strong correlation between spins and conduction electrons is key in spintronic materials and devices. A few ferro- or ferrimagnetic transition metal oxides such as La1−xSrxMnO3, Fe3O4, CrO2 and Sr2FeMoO6 have spin-polarized conduction electrons at room temperature, but it is difficult to find other spin-polarized oxides with high Curie temperatures (well above room temperature) and large magnetizations for spintronics applications. Here we show that an A- and B-site-ordered quadruple perovskite oxide, CaCu3Fe2Re2O12, has spin-polarized conduction electrons and is ferrimagnetic up to 560 K. The couplings between the three magnetic cations lead to the high Curie temperature, a large saturation magnetization of 8.7 μB and a half-metallic electronic structure, in which only minority-spin bands cross the Fermi level, producing highly spin-polarized conduction electrons. Spin polarization is confirmed by an observed low-field magnetoresistance effect in a polycrystalline sample. Optimization of CaCu3Fe2Re2O12 and related quadruple perovskite phases is expected to produce a new family of useful spintronic materials.

Date: 2014
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DOI: 10.1038/ncomms4909

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