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Title: Single-domain multiferroic BiFeO3 films

The strong coupling between antiferromagnetism and ferroelectricity at room temperature found in BiFeO3 generates high expectations for the design and development of technological devices with novel functionalities. However, the multi-domain nature of the material tends to nullify the properties of interest and complicates the thorough understanding of the mechanisms that are responsible for those properties. Here we report the realization of a BiFeO3 material in thin film form with single-domain behaviour in both its magnetism and ferroelectricity: the entire film shows its antiferromagnetic axis aligned along the crystallographic b axis and its ferroelectric polarization along the c axis. With this we are able to reveal that the canted ferromagnetic moment due to the Dzyaloshinskii–Moriya interaction is parallel to the a axis. Moreover, by fabricating a Co/BiFeO3 heterostructure, we demonstrate that the ferromagnetic moment of the Co film does couple directly to the canted moment of BiFeO3.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [4] ;  [5] ;  [3] ;  [2] ;  [6] ;  [1] ;  [7] ;  [7] ;  [8] ;  [1] ;  [9]
  1. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  2. National Tsing Hua Univ., Hsinchu (Taiwan)
  3. National Chiao Tung Univ., Hsinchu (Taiwan)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Xi'an Jiaotong Univ., Shaanxi (China)
  6. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  7. Synchrotron SOLEIL, Gif-sur-Yvette (France)
  8. Hiroshima Univ., Higashi-Hiroshima (Japan)
  9. National Chiao Tung Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
Publication Date:
OSTI Identifier:
1329167
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ferroelectric; multiferroic; piezoresponse force microscopy; domains