Improved multiferroic in EuTiO3 films by interphase strain engineering
Improved multiferroic in EuTiO3 films by interphase strain engineering
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DOI：
10.1016/j.cclet.2022.107796
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发表时间：
2022-09
影响因子：
9.1
通讯作者：
Yiyan Fan;Shiqing Deng;Tianyu Li;Qinghua Zhang;Shuaishuai Xu;Hao Li;C. Huo;Jiaou Wang;Lin Gu;K. Jin;O. Diéguez;E. Guo;Jun Chen
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文献类型：
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作者：
Yiyan Fan;Shiqing Deng;Tianyu Li;Qinghua Zhang;Shuaishuai Xu;Hao Li;C. Huo;Jiaou Wang;Lin Gu;K. Jin;O. Diéguez;E. Guo;Jun Chen
界面应变工程提供了一种独特的方法来显着修改跨单个膜的晶格结构，使传统的应变工程方法中无法访问的新功能的出现和操纵。在这项工作中，通过使用相间应变，我们实现了一个铁磁态的居里温度提高和室温极性状态的EuO二次相调谐的EuTiO 3薄膜。结合原子尺度的电子显微镜和同步辐射X射线光谱揭示了铁电和铁磁性能增强的潜在机制。其中，EuO第二相能够显著扭曲TiO 6八面体，有利于非中心对称极性态，减弱反铁磁Eu-Ti-Eu相互作用，增强铁磁Eu-O-Eu相互作用.我们的工作证明了相间应变工程在同时提高铁电和铁磁性能方面的可行性和有效性，这将为众多强相关功能材料的性能调控提供新的思路。
Interphase strain engineering provides a unique methodology to significantly modify the lattice structure across a single film, enabling the emergence and manipulation of novel functionalities that are inaccessible in the context of traditional strain engineering methods. In this work, by using the interphase strain, we achieve a ferromagnetic state with enhanced Curie temperature and a room-temperature polar state in EuO secondary phase-tunned EuTiO3thin films. A combination of atomic-scale electron microscopy and synchrotron X-ray spectroscopy unravels the underlying mechanisms of the ferroelectric and ferromagnetic properties enhancement. Wherein, the EuO secondary phase is found to be able to dramatically distort the TiO6octahedra, which favors the non-centrosymmetric polar state, weakens antiferromagnetic Eu-Ti-Eu interactions, and enhances ferromagnetic Eu-O-Eu interactions. Our work demonstrates the feasibility and effectiveness of interphase strain engineering in simultaneously promoting ferroelectric and ferromagnetic performance, which would provide new thinking on the property regulation of numerous strongly correlated functional materials.