Periodic Giant Polarization Gradients in Doped BiFeO3 Thin Films

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The ultimate challenge for the development of new multiferroics with enhanced properties lies in achieving nanoscale control of the coupling between different ordering parameters. In oxide-based multiferroics, substitutional cation dopants offer the unparalleled possibility to modify both the electric and magnetic properties at a local scale. Herein it is demonstrated the formation of a dopant-controlled polar pattern in BiFeO3 leading to the spontaneous instauration of periodic polarization waves. In particular, nonpolar Ca-doped rich regions act as spacers between consecutive dopant-depleted regions displaying coupled ferroelectric states. This alternation of layers with different ferroelectric state creates a novel vertical polar structure exhibiting giant polarization gradients as large as 70 mu C cm(-2) across 30 angstrom thick domains. The drastic change in the polar state of the film is visualized using high-resolution differential phase-contrast imaging able to map changes in ferroelectric polarization at atomic scale. Furthermore, a periodic distortion in the Fe-O-Fe bonding angle suggests a local variation in the magnetic ordering. The findings provide a new insight into the role of doping and reveal hitherto unexplored means to tailor the functional properties of multiferroics by doping engineering.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-02
Language
English
Article Type
Article
Keywords

FERROELECTRIC PROPERTIES; ROOM-TEMPERATURE; MULTIFERROICS; STRAIN; ENHANCEMENT; PEROVSKITES; MICROSCOPY

Citation

NANO LETTERS, v.18, no.2, pp.717 - 724

ISSN
1530-6984
DOI
10.1021/acs.nanolett.7b03817
URI
http://hdl.handle.net/10203/240945
Appears in Collection
PH-Journal Papers(저널논문)
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