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Effect of Substrate on Structure and Multiferrocity of ( La , Mn ) CoSubstituted BiFeO 3 Thin Films
Author(s) -
Wang D. Y.,
Ding R.,
Li S.
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12360
Subject(s) - ferroelectricity , monoclinic crystal system , multiferroics , materials science , thin film , reciprocal lattice , epitaxy , polarization (electrochemistry) , crystallography , crystal structure , nanotechnology , chemistry , optoelectronics , optics , diffraction , dielectric , physics , layer (electronics)
In this article, we report the substrate effect on ferroelectric and magnetic properties of epitaxial BiFeO 3 ‐based thin films at room temperature. ( La , Mn ) cosubstituted BiFeO 3 ( BFOLM ) thin films were deposited on differently lattice mismatched single‐crystal substrates to manipulate the strain states in the as‐deposited films. All the films with 30‐nm thick CaRuO 3 bottom electrodes exhibited highly epitaxial growth behavior with a slightly monoclinic distorted lattice structure while their strain states are drastically different as confirmed by X‐ray reciprocal space mapping. These films possessed significantly different macroscopic ferroelectric properties with giant remanent polarization of 101 ± 2, 65 ± 2, and 48 ± 2 μC/cm 2 for the films grown on SrTiO 3 , ( La , Sr )( Al , Ta ) O 3 , and LaAlO 3 , respectively. It is found that the room‐temperature magnetic properties are also in accordance with their strain state, having a reciprocal relationship with polarization. For example, the enhanced magnetization is associated with the suppressed polarization and vice versa. The stain tunability of multiferroic properties in BFOLM thin films are presumably ascribed to the polarization rotation and oxygen octahedral tilts.