High-pressure synthesis and high-performance half metallicity of quadruple perovskite oxide DyCu3Fe2Re2O12

The A - and B -site ordered quadruple perovskite oxide DyCu 3 Fe 2 Re 2 O 12 with cubic Pn -3 symmetry was synthesized under high-pressure and high-temperature conditions. The material experiences a sharp long-range ferrimagnetic transition arising from the strong superexchange antiferromagnetic interactions of Cu-Re and Fe-Re at a high Curie temperature ( T C ≈ 660 K). Owing to the influence at lower temperatures of the antiferromagnetic ordering of the Dy 3+ occupying the A -site, the susceptibility of DyCu 3 Fe 2 Re 2 O 12 decreases continuously below 50 K, which is essentially different from that of the isostructural compound LaCu 3 Fe 2 Re 2 O 12 . Moreover, in the presence of a magnetic field, the A -site Dy 3+ spins are readily transformed into the ferromagnetic state from the antiferromagnetic ground state. Thus, the saturated magnetic moment of DyCu 3 Fe 2 Re 2 O 12 is sharply enhanced from 7.0 μ B /f.u. at 300 K to 14 μ B /f.u. at 2 K by applying a magnetic field of 7 T. Theoretical calculations suggest that DyCu 3 Fe 2 Re 2 O 12 is a half-metallic ferrimagnet with a spin-up band gap of approximately 2.0 eV. The combination of the high Curie temperature, wide half-metallic energy gap, and large magnetic moment makes DyCu 3 Fe 2 Re 2 O 12 promising for potential applications in advanced spintronic devices. Half metals have promising applications in advanced spintronic devices because of their unique band structure. We synthesized a new high-performance half metal DyCu 3 Fe 2 Re 2 O 12 with a high Curie temperature TC = 660 K. Moreover, at high magnetic field, the A-site Dy 3+ spins are readily transformed into the ferromagnetic state from the antiferromagnetic ground state. The current DyCu 3 Fe 2 Re 2 O 12 provides promising applications in advanced spintronic devices and the tuning of magnetic properties promotes an avenue for exploring high performance HMFs at room temperature