Ambipolar ferromagnetism by electrostatic doping of a manganite
- Harbin Inst. of Technology, Harbin (China)
- Nanyang Technological Univ. (Singapore)
- National Univ. of Singapore (Singapore)
- Univ. of Nebraska, Lincoln, NE (United States)
- Beihang Univ., Beijing (China)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Harbin Inst. of Technology, Guangzhou (China)
- Tongji Univ., Shanghai (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Trinity College, Dublin (Ireland); Beihang Univ., Beijing (China)
- Harbin Inst. of Technology, Harbin (China); The Pennsylvania State Univ., University Park, PA (United States)
Complex-oxide materials exhibit physical properties that involve the interplay of charge and spin degrees of freedom. However, an ambipolar oxide that is able to exhibit both electron-doped and hole-doped ferromagnetism in the same material has proved elusive. Here we report ambipolar ferromagnetism in LaMnO3, with electron-hole asymmetry of the ferromagnetic order. Starting from an undoped atomically thin LaMnO3 film, we electrostatically dope the material with electrons or holes according to the polarity of a voltage applied across an ionic liquid gate. Magnetotransport characterization reveals that an increase of either electron-doping or hole-doping induced ferromagnetic order in this antiferromagnetic compound, and leads to an insulator-to-metal transition with colossal magnetoresistance showing electron-hole asymmetry. These findings are supported by density functional theory calculations, showing that strengthening of the inter-plane ferromagnetic exchange interaction is the origin of the ambipolar ferromagnetism. The result raises the prospect of exploiting ambipolar magnetic functionality in strongly correlated electron systems.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1460348
- Journal Information:
- Nature Communications, Vol. 9, Issue 1; Related Information: © 2018 The Author(s).; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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