期刊
NANO LETTERS
卷 12, 期 9, 页码 4966-4970出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl302562f
关键词
Perovskite cobaltites; pulsed laser epitaxy; epitaxial strain induced spin states; ferromagnetic ordering; local lattice symmetry modulation
类别
资金
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- NSERC
- NRC
- CIHR
- University of Saskatchewan
- Deutsche Forschungsgemeinschaft [TRR80]
- National Research Foundation of Korea
- Korea government (MEST) [2012-0005637]
Epitaxial strain imposed in complex oxide thin films by heteroepitaxy is recognized as a powerful tool for identifying new properties and exploring the vast potential of materials performance. A particular example is LaCoO3, a zero spin, nonmagnetic material in the bulk, whose strong ferromagnetism in a thin film remains enigmatic despite a decade of intense research. Here, we use scanning transmission electron microscopy complemented by X-ray and optical spectroscopy to study LaCoO3 epitaxial thin films under different strain states. We observed an unconventional strain relaxation behavior resulting in stripe-like, lattice modulated patterns, which did not involve uncontrolled misfit dislocations or other defects. The modulation entails the formation of ferromagnetically ordered sheets comprising intermediate or high spin Co3+, thus offering an unambiguous description for the exotic magnetism found in epitaxially strained LaCoO3 films. This observation provides a novel route to tailoring the electronic and magnetic properties of functional oxide heterostructures.
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