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Title: Ambipolar ferromagnetism by electrostatic doping of a manganite

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 LaMnO 3, with electron-hole asymmetry of the ferromagnetic order. Starting from an undoped atomically thin LaMnO 3 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.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ; ORCiD logo [5] ;  [3] ;  [3] ;  [3] ;  [6] ; ORCiD logo [7] ;  [3] ; ORCiD logo [8] ;  [1] ;  [8] ; ORCiD logo [9] ;  [3] ;  [4] ; ORCiD logo [10] ;  [11]
  1. Harbin Inst. of Technology, Harbin (China)
  2. Nanyang Technological Univ. (Singapore)
  3. National Univ. of Singapore (Singapore)
  4. Univ. of Nebraska, Lincoln, NE (United States)
  5. Beihang Univ., Beijing (China)
  6. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Harbin Inst. of Technology, Guangzhou (China)
  7. Tongji Univ., Shanghai (China)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  10. Trinity College, Dublin (Ireland); Beihang Univ., Beijing (China)
  11. Harbin Inst. of Technology, Harbin (China); The Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Related Information: © 2018 The Author(s).; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1460348