Strain-induced high-temperature perovskite ferromagnetic insulator

Author:

Meng Dechao,Guo Hongli,Cui Zhangzhang,Ma Chao,Zhao Jin,Lu Jiangbo,Xu Hui,Wang Zhicheng,Hu Xiang,Fu Zhengping,Peng Ranran,Guo Jinghua,Zhai Xiaofang,Brown Gail J.,Knize Randy,Lu Yalin

Abstract

Ferromagnetic insulators are required for many new magnetic devices, such as dissipationless quantum-spintronic devices, magnetic tunneling junctions, etc. Ferromagnetic insulators with a high Curie temperature and a high-symmetry structure are critical integration with common single-crystalline oxide films or substrates. So far, the commonly used ferromagnetic insulators mostly possess low-symmetry structures associated with a poor growth quality and widespread properties. The few known high-symmetry materials either have extremely low Curie temperatures (≤16 K), or require chemical doping of an otherwise antiferromagnetic matrix. Here we present compelling evidence that the LaCoO3 single-crystalline thin film under tensile strain is a rare undoped perovskite ferromagnetic insulator with a remarkably high TC of up to 90 K. Both experiments and first-principles calculations demonstrate tensile-strain–induced ferromagnetism which does not exist in bulk LaCoO3. The ferromagnetism is strongest within a nearly stoichiometric structure, disappearing when the Co2+ defect concentration reaches about 10%. Significant impact of the research includes demonstration of a strain-induced high-temperature ferromagnetic insulator, successful elevation of the transition over the liquid-nitrogen temperature, and high potential for integration into large-area device fabrication processes.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

External Cooperation Program of BIC, CAS

Key Research Program of CAS

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Fundamental Research Funds for the Central Universities

DOE Office of Science User Facility

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

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