| Title | Role of oxygen vacancies in colossal polarization in SmFeO3-delta thin films |
| Authors | Li, Hao Yang, Yali Deng, Shiqing Zhang, Linxing Cheng, Sheng Guo, Er-Jia Zhu, Tao Wang, Huanhua Wang, Jiaou Wu, Mei Gao, Peng Xiang, Hongjun Xing, Xianran Chen, Jun |
| Affiliation | Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing 100083, Peoples R China Univ Sci & Technol Beijing, Dept Phys Chem, Beijing 100083, Peoples R China Fudan Univ, Minist Educ, Key Lab Computat Phys Sci, State Key Lab Surface Phys, Shanghai 200433, Peoples R China Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China Shanghai Qizhi Inst, Shanghai 200232, Peoples R China Univ Sci & Technol Beijing, Sch Math & Phys, Beijing 100083, Peoples R China Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Beijing 100084, Peoples R China Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China Peking Univ, Electron Microscopy Lab, Sch Phys, Beijing 100871, Peoples R China Peking Univ, Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China |
| Keywords | MULTIFERROICITY |
| Issue Date | Apr-2022 |
| Publisher | SCIENCE ADVANCES |
| Abstract | The orthorhombic rare-earth manganates and ferrites multiferroics are promising candidates for the next generation multistate spintronic devices. However, their ferroelectric polarization is small, and transition temperature is far below room temperature (RT). The improvement of ferroelectricity remains challenging. Here, through the subtle strain and defect engineering, an RT colossal polarization of 4.14 mu C/cm(2) is achieved in SmFeO3-delta films, which is two orders of magnitude larger than its bulk and is also the largest one among the orthorhombic rare-earth manganite and ferrite family. Meanwhile, its RT magnetism is uniformly distributed in the film. Combining the integrated differential phase-contrast imaging and density functional theory calculations, we reveal the origin of this superior ferroelectricity in which the purposely introduced oxygen vacancies in the Fe-O layer distorts the FeO6 octahedral cage and drives the Fe ion away from its high-symmetry position. The present approach can be applied to improve ferroelectric properties for multiferroics. |
| URI | http://hdl.handle.net/20.500.11897/642028 |
| ISSN | 2375-2548 |
| DOI | 10.1126/sciadv.abm8550 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 |
