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Title: Ambipolar ferromagnetism by electrostatic doping of a manganite

Journal Article · · Nature Communications
 [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)

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
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (11)

Interface Engineering and Emergent Phenomena in Oxide Heterostructures journal August 2018
Voltage‐Control of Magnetism in All‐Solid‐State and Solid/Liquid Magnetoelectric Composites journal February 2019
Controlling the Magnetic Properties of LaMnO 3 /SrTiO 3 Heterostructures by Stoichiometry and Electronic Reconstruction: Atomic‐Scale Evidence journal May 2019
Electric‐Field‐Controlled Antiferromagnetic Spintronic Devices journal March 2020
Conductive Oxide Interfaces for Field Effect Devices journal June 2019
Noncollinear spintronics and electric-field control: a review journal December 2019
Absence of superconductivity in Nd0.8Sr0.2NiOx thin films without chemical reduction journal March 2020
Charge-governed phase manipulation of few-layer tellurium journal January 2018
Tailoring magnetic order via atomically stacking 3 d /5 d electrons to achieve high-performance spintronic devices journal March 2020
Exchange-biased nanocomposite ferromagnetic insulator journal January 2020
Voltage-Control of Magnetism in All-Solid-State and Solid/Liquid Magnetoelectric Composites text January 2019

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