[이준한 학생/오윤석 교수] 1차원 체인 다강체에서 상온 자기전기 상호작용 발견

A Room‐Temperature Magnetoelectric Coupling in a 1D Chain Multiferroic
May 15, 2019  |  편집장

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.

Authors : Kyeong Tae Kang, Chang Jae Roh, Jinyoung Lim, Taewon Min, Jun Han Lee, Kyoungjun Lee, Tae Yoon Lee, Seunghun Kang, Daehee Seol, Jiwoong Kim, Hiromichi Ohta, Amit Khare, Sungkyun Park, Yunseok Kim, Seung Chul Chae, Yoon Seok Oh, Jaekwang Lee, Jaejun Yu, Jong Seok Lee, Woo Seok Choi

Journal : Advanced Materials, 29 April 2019.

https://doi.org/10.1002/adma.201808104

연구실 홈페이지 : http://xpem.unist.ac.kr/

Journal Reference:
https://doi.org/10.1002/adma.201808104