Magnetoelectric phase transition driven by interfacial-engineered Dzyaloshinskii-Moriya interaction

Xin Liu, Wenjie Song, Mei Wu, Yuben Yang, Ying Yang, Peipei Lu, Yinhua Tian, Yuanwei Sun, Jingdi Lu, Jing Wang, Dayu Yan, Youguo Shi, Nian Xiang Sun, Young Sun, Peng Gao (), Ka Shen, Guozhi Chai, Supeng Kou, Ce-Wen Nan () and Jinxing Zhang ()
Additional contact information
Xin Liu: Beijing Normal University
Wenjie Song: Lanzhou University
Mei Wu: Peking University
Yuben Yang: Beijing Normal University
Ying Yang: Beijing Normal University
Peipei Lu: Chinese Academy of Sciences
Yinhua Tian: Lanzhou University
Yuanwei Sun: Peking University
Jingdi Lu: Beijing Normal University
Jing Wang: Tsinghua University
Dayu Yan: Chinese Academy of Sciences
Youguo Shi: Chinese Academy of Sciences
Nian Xiang Sun: Northeastern University
Young Sun: Chinese Academy of Sciences
Peng Gao: Peking University
Ka Shen: Beijing Normal University
Guozhi Chai: Lanzhou University
Supeng Kou: Beijing Normal University
Ce-Wen Nan: Tsinghua University
Jinxing Zhang: Beijing Normal University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Strongly correlated oxides with a broken symmetry could exhibit various phase transitions, such as superconductivity, magnetism and ferroelectricity. Construction of superlattices using these materials is effective to design crystal symmetries at atomic scale for emergent orderings and phases. Here, antiferromagnetic Ruddlesden-Popper Sr2IrO4 and perovskite paraelectric (ferroelectric) SrTiO3 (BaTiO3) are selected to epitaxially fabricate superlattices for symmetry engineering. An emergent magnetoelectric phase transition is achieved in Sr2IrO4/SrTiO3 superlattices with artificially designed ferroelectricity, where an observable interfacial Dzyaloshinskii-Moriya interaction driven by non-equivalent interface is considered as the microscopic origin. By further increasing the polarization namely interfacial Dzyaloshinskii-Moriya interaction via replacing SrTiO3 with BaTiO3, the transition temperature can be enhanced from 46 K to 203 K, accompanying a pronounced magnetoelectric coefficient of ~495 mV/cm·Oe. This interfacial engineering of Dzyaloshinskii-Moriya interaction provides a strategy to design quantum phases and orderings in correlated electron systems.

Date: 2021
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DOI: 10.1038/s41467-021-25759-1

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