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Title
Japanese:Room-Temperature Antiferroelectricity in Multiferroic Hexagonal Rare-Earth Ferrites 
English:Room-Temperature Antiferroelectricity in Multiferroic Hexagonal Rare-Earth Ferrites 
Author
Japanese: Jun Kasahara, 片山 司, 川本 思心, 近松 彰, 濵嵜 容丞, 安井 伸太郎, 伊藤 満, 長谷川 哲也.  
English: Jun Kasahara, Tsukasa Katayama, Shishin Mo, Akira Chikamatsu, Yosuke Hamasaki, Shintaro Yasui, Mitsuru Itoh, Tetsuya Hasegawa.  
Language English 
Journal/Book name
Japanese:ACS Applied Materials & Interfaces 
English:ACS Applied Materials & Interfaces 
Volume, Number, Page Vol. 129        pp. 4230-4235
Published date Jan. 2021 
Publisher
Japanese: 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.1021/acsami.0c20924
 
DOI https://doi.org/10.1021/acsami.0c20924
Abstract The antiferroelectric (AFE) phase, in which nonpolar and polar states are switchable by an electric field, is a recent discovery in promising multiferroics of hexagonal rareearth manganites (ferrites), h-RMn(Fe)O3. However, this phase has so far only been observed at 60−160 K, which restricts key investigations into the microstructures and magnetoelectric behaviors. Herein, we report the successful expansion of the AFE temperature range (10−300 K) by preparing h-DyFeO3 films through epitaxial stabilization. Room-temperature scanning transmission electron microscopy reveals that the AFE phase originates from a nanomosaic structure comprising AFE P3̅c1 and ferroelectric P63cm domains with small domain sizes of 1− 10 nm. The nanomosaic structure is stabilized by a low c/a ratio derived from the large ionic radius of Dy3+. Furthermore, weak ferromagnetism and magnetocapacitance behaviors are observed. Below 10 K, the film exhibits an M-shaped magnetocapacitance versus magnetic field curve, indicating unusual magnetoelectric coupling in the AFE phase.

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