Electric-field control of oxygen vacancies and magnetic phase transition in a 
cobaltite/manganite bilayer

Cui, B.; Song, C.; Li, F.; Zhong, X. Y.; Wang, Z. C.; Werner, P.; Gu, Y. D.; Wu, H. Q.; Saleem, M. S.; Parkin, S. S. P.; Pan, F.

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Journal Article

Electric-field control of oxygen vacancies and magnetic phase transition in a cobaltite/manganite bilayer

MPS-Authors

Cui, B.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

Werner, P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin, S. S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1103/PhysRevApplied.8.044007
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Citation

Cui, B., Song, C., Li, F., Zhong, X. Y., Wang, Z. C., Werner, P., et al. (2017). Electric-field control of oxygen vacancies and magnetic phase transition in a cobaltite/manganite bilayer. Physical Review Applied, 8(4): 044007.

Cite as: https://hdl.handle.net/21.11116/0000-000A-E8A3-8

Abstract

Manipulation of oxygen vacancies (V_O) in single oxide layers by varying the electric field can result in significant modulation of the ground state. However, in many oxide multilayers with strong application potentials, e.g., ferroelectric tunnel junctions and solid-oxide fuel cells, understanding V_O behavior in various layers under an applied electric field remains a challenge, owing to complex V_O transport between different layers. By sweeping the external voltage, a reversible manipulation of V_O and a corresponding fixed magnetic phase transition sequence in cobaltite/manganite (SrCoO_3−x/La_0.45Sr_0.55MnO_3−y) heterostructures are reported. The magnetic phase transition sequence confirms that the priority of electric-field-induced V_O formation or annihilation in the complex bilayer system is mainly determined by the V_O formation energies and Gibbs free-energy differences, which is supported by theoretical analysis. We not only realize a reversible manipulation of the magnetic phase transition in an oxide bilayer but also provide insight into the electric-field control of V_O engineering in heterostructures.