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Adv Mater. 2019 Jun;31(24):e1808104. doi: 10.1002/adma.201808104. Epub 2019 Apr 29.

A Room-Temperature Ferroelectric Ferromagnet in a 1D Tetrahedral Chain Network.

Author information

1
Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
2
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
3
Department of Physics and Astronomy, Center for Theoretical Physics, Seoul National University, Seoul, 08826, Republic of Korea.
4
Department of Physics, Pusan National University, Busan, 46241, Republic of Korea.
5
Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea.
6
Department of Physics Education, Seoul National University, Seoul, 08826, Republic of Korea.
7
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
8
Research Institute for Electronic Science, Hokkaido University, Sapporo, 001-0020, Japan.

Abstract

Ferroelectricity occurs in crystals with broken spatial inversion symmetry. In conventional perovskite oxides, concerted ionic displacements within a 3D network of transition-metal-oxygen polyhedra (MOx ) manifest spontaneous polarization. Meanwhile, some 2D networks of MOx foster geometric ferroelectricity with magnetism, owing to the distortion of the polyhedra. Because of the fundamentally different mechanism of ferroelectricity in a 2D network, one can further challenge an uncharted mechanism of ferroelectricity in a 1D channel of MOx and estimate its feasibility. Here, ferroelectricity and coupled ferromagnetism in a 1D FeO4 tetrahedral chain network of a brownmillerite SrFeO2.5 epitaxial thin film are presented. The result provides a new paradigm for designing low-dimensional MOx networks, which is expected to benefit the realization of macroscopic ferro-ordering materials including ferroelectric ferromagnets.

KEYWORDS:

1D tetrahedral networks; SrFeO2.5; ferroelectricity; magnetoelectric coupling; multiferroicity

PMID:
31034128
DOI:
10.1002/adma.201808104

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