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Room-Temperature Antiferroelectricity in Multiferroic Hexagonal Rare-Earth Ferrites
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-11 , DOI: 10.1021/acsami.0c20924 Jun Kasahara 1 , Tsukasa Katayama 1 , Shishin Mo 1 , Akira Chikamatsu 1 , Yosuke Hamasaki 2 , Shintaro Yasui 3 , Mitsuru Itoh 3 , Tetsuya Hasegawa 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-11 , DOI: 10.1021/acsami.0c20924 Jun Kasahara 1 , Tsukasa Katayama 1 , Shishin Mo 1 , Akira Chikamatsu 1 , Yosuke Hamasaki 2 , Shintaro Yasui 3 , Mitsuru Itoh 3 , Tetsuya Hasegawa 1
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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 rare-earth 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.
中文翻译：
多铁性六方稀土铁氧体的室温反铁电
反铁电（AFE）相（其中非极性和极性状态可通过电场切换）是六方稀土锰酸盐（铁氧体）h - R Mn（Fe）O 3的有前景的多铁性物的最新发现。但是，到目前为止，仅在60–160 K时才观察到该相，这限制了对微观结构和磁电行为的关键研究。在这里，我们报道了通过外延稳定制备h -DyFeO 3薄膜，成功扩大了AFE温度范围（10–300 K）。室温扫描透射电子显微镜揭示，从包括AFE一个nanomosaic结构的AFE相始发P 3 Ç1和铁电P 6 3 cm畴，具有1–10 nm的小畴尺寸。纳米马赛克结构由低的c / a比率稳定，该比率源自Dy 3+的大离子半径。此外，观察到弱的铁磁性和磁电容行为。低于10 K，该膜呈现M形磁电容与磁场的关系曲线，表明在AFE相中出现了异常的磁电耦合。
更新日期：2021-01-27
中文翻译：
多铁性六方稀土铁氧体的室温反铁电
反铁电（AFE）相（其中非极性和极性状态可通过电场切换）是六方稀土锰酸盐（铁氧体）h - R Mn（Fe）O 3的有前景的多铁性物的最新发现。但是，到目前为止，仅在60–160 K时才观察到该相，这限制了对微观结构和磁电行为的关键研究。在这里，我们报道了通过外延稳定制备h -DyFeO 3薄膜，成功扩大了AFE温度范围（10–300 K）。室温扫描透射电子显微镜揭示，从包括AFE一个nanomosaic结构的AFE相始发P 3 Ç1和铁电P 6 3 cm畴，具有1–10 nm的小畴尺寸。纳米马赛克结构由低的c / a比率稳定，该比率源自Dy 3+的大离子半径。此外，观察到弱的铁磁性和磁电容行为。低于10 K，该膜呈现M形磁电容与磁场的关系曲线，表明在AFE相中出现了异常的磁电耦合。
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