title: Single-domain multiferroic BiFeO3 films.
abstract: 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. Furthermore, 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: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str 40, 01187 Dresden, Germany.
authors: C-Y
authors: CY
authors: Kuo
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str 40, 01187 Dresden, Germany.
authors: Z
authors: Z
authors: Hu
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str 40, 01187 Dresden, Germany.
authors: J C
authors: JC
authors: Yang
authors: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors: S-C
authors: SC
authors: Liao
authors: Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.
authors: Y L
authors: YL
authors: Huang
authors: Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, US.
authors: R K
authors: RK
authors: Vasudevan
authors: Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, US.
authors: M B
authors: MB
authors: Okatan
authors: Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, US.
authors: S
authors: S
authors: Jesse
authors: Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, US.
authors: S V
authors: SV
authors: Kalinin
authors: Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, US.|Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors: L
authors: 0000-0001-5354-6152
authors: L
authors: Li
authors: Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.
authors: H J
authors: HJ
authors: Liu
authors: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors: C-H
authors: CH
authors: Lai
authors: National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.
authors: T W
authors: TW
authors: Pi
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str 40, 01187 Dresden, Germany.
authors: S
authors: S
authors: Agrestini
authors: Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin - BP 48, 91192 GIF-sur-YVETTE, France.
authors: K
authors: K
authors: Chen
authors: Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin - BP 48, 91192 GIF-sur-YVETTE, France.
authors: P
authors: P
authors: Ohresser
authors: Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan.
authors: A
authors: A
authors: Tanaka
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str 40, 01187 Dresden, Germany.
authors: L H
authors: LH
authors: Tjeng
authors: Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.|Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan.|Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
authors: Y H
authors: YH
authors: Chu