Complex strain evolution of polar and magnetic order in multiferroic BiFeO3 thin films

Zuhuang Chen (), Zhanghui Chen, Chang-Yang Kuo, Yunlong Tang, Liv R. Dedon, Qian Li, Lei Zhang, Christoph Klewe, Yen-Lin Huang, Bhagwati Prasad, Alan Farhan, Mengmeng Yang, James D. Clarkson, Sujit Das, Sasikanth Manipatruni, A. Tanaka, Padraic Shafer, Elke Arenholz, Andreas Scholl, Ying-Hao Chu, Z. Q. Qiu, Zhiwei Hu, Liu-Hao Tjeng, Ramamoorthy Ramesh, Lin-Wang Wang and Lane W. Martin ()
Additional contact information
Zuhuang Chen: Harbin Institute of Technology
Zhanghui Chen: Lawrence Berkeley National Laboratory
Chang-Yang Kuo: Max-Planck Institute for Chemical Physics of Solids
Yunlong Tang: University of California
Liv R. Dedon: University of California
Qian Li: University of California
Lei Zhang: University of California
Christoph Klewe: Lawrence Berkeley National Laboratory
Yen-Lin Huang: University of California
Bhagwati Prasad: University of California
Alan Farhan: Lawrence Berkeley National Laboratory
Mengmeng Yang: University of California
James D. Clarkson: University of California
Sujit Das: University of California
Sasikanth Manipatruni: Intel Corp.
A. Tanaka: Hiroshima University
Padraic Shafer: Lawrence Berkeley National Laboratory
Elke Arenholz: Lawrence Berkeley National Laboratory
Andreas Scholl: Lawrence Berkeley National Laboratory
Ying-Hao Chu: National Chiao Tung University
Z. Q. Qiu: University of California
Zhiwei Hu: Max-Planck Institute for Chemical Physics of Solids
Liu-Hao Tjeng: Max-Planck Institute for Chemical Physics of Solids
Ramamoorthy Ramesh: University of California
Lin-Wang Wang: Lawrence Berkeley National Laboratory
Lane W. Martin: University of California

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Electric-field control of magnetism requires deterministic control of the magnetic order and understanding of the magnetoelectric coupling in multiferroics like BiFeO3 and EuTiO3. Despite this critical need, there are few studies on the strain evolution of magnetic order in BiFeO3 films. Here, in (110)-oriented BiFeO3 films, we reveal that while the polarization structure remains relatively unaffected, strain can continuously tune the orientation of the antiferromagnetic-spin axis across a wide angular space, resulting in an unexpected deviation of the classical perpendicular relationship between the antiferromagnetic axis and the polarization. Calculations suggest that this evolution arises from a competition between the Dzyaloshinskii–Moriya interaction and single-ion anisotropy wherein the former dominates at small strains and the two are comparable at large strains. Finally, strong coupling between the BiFeO3 and the ferromagnet Co0.9Fe0.1 exists such that the magnetic anisotropy of the ferromagnet can be effectively controlled by engineering the orientation of the antiferromagnetic-spin axis.

Date: 2018
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DOI: 10.1038/s41467-018-06190-5

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