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Controlling the Electrical and Magnetoelectric Properties of Epitaxially Strained Sr 1− x Ba x MnO 3 Thin Films
Author(s) -
Langenberg Eric,
Maurel Laura,
Marcano Noelia,
Guzmán Roger,
Štrichovanec Pavel,
Prokscha Thomas,
Magén César,
Algarabel Pedro A.,
Pardo José A.
Publication year - 2017
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201601040
Subject(s) - materials science , epitaxy , condensed matter physics , antiferromagnetism , dielectric , magnetism , lattice constant , coupling (piping) , perovskite (structure) , diffraction , crystallography , nanotechnology , optoelectronics , composite material , layer (electronics) , chemistry , physics , optics
The perovskite (Sr,Ba)MnO 3 system is an ideal candidate for tailoring electrical and magnetoelectric properties through the accurate control of Ba content and epitaxial strain due to the strong coupling between polar instability, spin order, and lattice. Here, first, the polar order is proved to be induced in Sr 1− x Ba x MnO 3 thin films through lattice expansion either by epitaxial strain or chemical pressure, which correlates with the evolution of the dielectric properties. Second, due to strong spin–phonon coupling, a large magnetoelectric response is found in the (Sr,Ba)MnO 3 system, in which the dielectric constant drops up to 50% when the antiferromagnetic order emerges, larger than most magnetoelectric oxides. More important, this coupling between magnetism and dielectric properties can be tuned from ≈18% to ≈50% by appropriately selecting Ba content and epitaxial strain. Third, a clear trend of increasing the band gap energy on increasing the unit cell volume either by epitaxial strain or chemical pressure is found, which opens the way for engineering the semiconducting properties of (Sr,Ba)MnO 3 system at will. Thus, this work proves the possibility to design the electrical response and the magnetoelectric coupling in (Sr,Ba)MnO 3 system.