Strain-induced high-temperature perovskite ferromagnetic insulator
- Univ. of Science and Technology of China, Anhui (People's Republic of China)
- Univ. of Science and Technology of China, Anhui (People's Republic of China); Chinese Academy of Sciences, Anhui (People's Republic of China)
- Univ. of Science and Technology of China, Anhui (People's Republic of China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Shaanxi Normal Univ., Shaanxi (People's Republic of China)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
- Wright-Patterson Air Force Base (AFB), Wright-Patterson AFB, OH (United States)
- US Air Force Academy, CO (United States)
- Univ. of Science and Technology of China, Anhui (People's Republic of China); Wright-Patterson Air Force Base (AFB), Wright-Patterson AFB, OH (United States); US Air Force Academy, CO (United States)
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%. Furthermore, 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1465448
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Vol. 115, Issue 12; Related Information: © 2018 National Academy of Sciences. All rights reserved.; ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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