Room-temperature multiferroic hexagonal LuFeO${}_3$ films

Abstract

The crystal and magnetic structures of single-crystalline hexagonal LuFeO${}_3$ films have been studied using x-ray, electron and neutron diffraction methods. The polar structure of these films are found to persist up to 1050 K; and the switchability of the polar behavior is observed at room temperature, indicating ferroelectricity. An antiferromagnetic order was shown to occur below 440 K, followed by a spin reorientation resulting in a weak ferromagnetic order below 130 K. This observation of coexisting multiple ferroic orders demonstrates that hexagonal LuFeO${}_3$ films are room-temperature multiferroics.

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• Cyrstal field splitting and optical band gap of hexagonal LuFeO${}_3$ films
• Micromagnetic simulations of interacting dipoles on a fcc lattice: Application to nanoparticle assemblies
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