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Seung Han Lee, Guo Tian, Tae Cheol KIm, Hyun Kyu Jung, Jun Woo Choi, Frederick J Walker, Charles H Ahn, Caroline A Ross, Dong Hun Kim
The structure, magnetic and ferroelectric properties of sputtered epitaxial CoFe2O4-BiFeO3 (CFO-BFO) nanocomposite thin films grown on La0.7Sr0.3MnO3 (LSMO) layers on (001) oriented SrTiO3 (STO) substrates and on STO-buffered Si are described. The as-grown LSMO thin films were smooth and poorly conductive but the resistivity was reduced and the surfaces roughened after annealing. Cosputtered CFO and BFO on STO formed vertically aligned nanostructures consisting of epitaxial spinel CFO pillars within a perovskite BFO matrix, but the rough surface of the annealed LSMO film promoted additional CFO pillar orientations...
December 11, 2018: Nanotechnology
Juncai Dong, Xiaoli Zhang, Yan Wang, Yu Gong, Pengfei An, Haijing Li, Zhiying Guo, Xinyu Hao, Quanjie Jia, Dongliang Chen
Substitution of bismuth by rare-earth (RE) ions is of great technological importance to develop room-temperature BiFeO3-based multiferroic materials. Despite this interest, many fundamental properties and the structure-property correlations of RE-doped BiFeO3 remain poorly understood. Here we report a systematical experimental and theoretical exploration on the structural phase transition in Bi1-xLaxFeO3 (0 ≤ x ≤ 0.2) ceramics. By using x-ray absorption fine structure spectroscopy, we for the first time show that the La3+ dopants in fact substitute the Bi site of a secondary nanosized particles with orthorhombic Pbam symmetry instead of the long-believed parental rhombohedral R3c phase at all La3+ doping concentrations (0...
December 5, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
T Sarkar, G Muscas, G Barucca, F Locardi, G Varvaro, D Peddis, R Mathieu
The properties of magnetic nanocomposites rely strongly on the interplay between those of the constituent components. When the individual components themselves are complex systems belonging to the family of correlated electron oxide systems which typically exhibit exotic physical properties, it becomes nontrivial to customize the properties of the nanocomposite. In this paper, we demonstrate an easy, but effective method to synthesize and tune the magnetic properties of nanocomposites consisting of correlated electron oxide systems as the individual components...
November 30, 2018: Nanoscale
Sasikanth Manipatruni, Dmitri E Nikonov, Chia-Ching Lin, Bhagwati Prasad, Yen-Lin Huang, Anoop R Damodaran, Zuhuang Chen, Ramamoorthy Ramesh, Ian A Young
Demonstration of ultralow energy switching mechanisms is imperative for continued improvements in computing devices. Ferroelectric (FE) and multiferroic (MF) order and their manipulation promise an ideal combination of state variables to reach attojoule range for logic and memory (i.e., ~30× lower switching energy than nanoelectronics). In BiFeO3 (BFO), the coupling between the antiferromagnetic (AFM) and FE order is robust at room temperature, scalable in voltage, stabilized by the FE order, and can be integrated into a fabrication process for a beyond-CMOS (complementary metal-oxide semiconductor) era...
November 2018: Science Advances
Shilu Tian, Can Wang, Yong Zhou, Xiaomei Li, Peng Gao, Jiesu Wang, Yu Feng, Xiaokang Yao, Chen Ge, Meng He, Xuedong Bai, Guozhen Yang, Kuijuan Jin
Exploring and manipulating the domain configurations in ferroelectric thin films are of critical importance for the design and fabrication of ferroelectric heterostructures with novel functional performance. In this study, BiFeO3 (BFO) ultrathin films with various Bi/Fe ratios from Bi-excess to Bi-deficient have been grown on (La0.7Sr0.3)MnO3 (LSMO) covered SrTiO3 substrates by laser molecular beam epitaxy system. Atomic force microscopy and piezoresponse force microscopy measurements show that both the surface morphology and ferroelectric polarization of the films are relevant to the Bi nonstoichiometry...
November 26, 2018: ACS Applied Materials & Interfaces
Lisha Liu, Tadej Rojac, Dragan Damjanovic, Marco Di Michiel, John Daniels
Dynamics of domain walls are among the main features that control strain mechanisms in ferroic materials. Here, we demonstrate that the domain-wall-controlled piezoelectric behaviour in multiferroic BiFeO3 is distinct from that reported in classical ferroelectrics. In situ X-ray diffraction was used to separate the electric-field-induced lattice strain and strain due to displacements of non-180° domain walls in polycrystalline BiFeO3 over a wide frequency range. These piezoelectric strain mechanisms have opposing trends as a function of frequency...
November 22, 2018: Nature Communications
Jie Jiang, Qiong Yang, Yi Zhang, Xiao-Yu Li, Pao-Wen Shao, Ying-Hui Hsieh, Heng-Jui Liu, Qiang-Xiang Peng, Gao-Kuo Zhong, Xiao-Qing Pan, Ying-Hao Chu, Yi-Chun Zhou
Self-assembled heteroepitaxial nanostructures have played an important role for miniaturization of electronic devices, e.g., the ultrahigh density ferroelectric memories, and cause for great concern. Our first principle calculations predict that the materials with low formation energy of the interface ( Ef ) tend to form matrix structure in self-assembled heteroepitaxial nanostructures, whereas those with high Ef form nanopillars. Under the guidance of the theoretical modeling, perovskite BiFeO3 (BFO) nanopillars are swimmingly grown into CeO2 matrix on single-crystal (001)-SrTiO3 (STO) substrates by pulsed laser deposition, where CeO2 has a lower formation energy of the interface ( Ef ) than BFO...
November 20, 2018: ACS Applied Materials & Interfaces
Chandan De, Ángel M Arévalo-López, Fabio Orlandi, Pascal Manuel, J Paul Attfield, Athinarayanan Sundaresan
Ordering of cations in different structural types occurs when there is a significant difference in the oxidation states and ionic radii of the ions involved. Herein we report an unusual ordering of isovalent cations Fe3+ and Al3+ in the polar rhombohedral R3 double perovskite structure of Bi2 FeAlO6 synthesized at high-pressure (6 GPa) and high-temperature (1000 °C). This ordered structure is derived from the 1:1 combination of the polar oxides BiFeO3 (R3c) and BiAlO3 (R3c), which results in reduction of symmetry to an R3 structure where the Fe3+ and Al3+ ions are ordered in a rock salt manner...
November 8, 2018: Angewandte Chemie
Xinjiang Hu, Weixuan Wang, Guangyu Xie, Hui Wang, Xiaofei Tan, Qi Jin, Daixi Zhou, Yunlin Zhao
A novel ternary composite of graphitic carbon nitride (g-C3 N4 )/graphene oxide (GO) sheets/BiFeO3 (CNGB) with highly enhanced visible-light photocatalytic activity toward Cr(VI) photoreduction is prepared and characterized. The characterization and photocatalysis experiments corroborate its reasonable band gap, efficient charge separation and transfer, widened visible-light adsorption, easy solid-liquid separation, good stability and superior catalytic activity of CNGB. Three CNGB samples with different ratios of g-C3 N4 and BiFeO3 (CNGB-1, -2, -3 with 2:4, 3:3, and 4:2, respectively), though possessing different adsorption ability, eventually remove all Cr(VI) ions via photocatalysis within 90 min...
February 2019: Chemosphere
Amit Kumar, Sunil Kumar Sharma, Gaurav Sharma, Ala'a H Al-Muhtaseb, Mu Naushad, Ayman A Ghfar, Florian J Stadler
Metallic Ag deposited BiPO4 /BiOBr/BiFeO3 ternary nano-hetero-structures were rationally designed and synthesized by a simple precipitation-wet impregnation-photo deposition method. The plasmonic junction possesses an excellent wide spectrum photo-response and makes best use of BiPO4 which is otherwise a poor photocatalyst. Ag@BiPO4 /BiOBr/BiFeO3 showed superior photocatalytic activity for degradation of norfloxacin (NFN) under visible, ultra-violet, near-infra-red and natural solar light. Especially catalyst APBF-3 (0...
October 22, 2018: Journal of Hazardous Materials
F Haydous, N D Scarisoreanu, R Birjega, V Ion, T Lippert, N Dumitrescu, A Moldovan, A Andrei, V S Teodorescu, C Ghica, R Negrea, M Dinescu
We report significant photoelectrochemical activity of Y-doped BiFeO3 (Y-BFO) epitaxial thin films deposited on Nb:SrTiO3 substrates. The Y-BFO photoanodes exhibit a strong dependence of the photocurrent values on the thickness of the films, and implicitly on the induced epitaxial strain. The peculiar crystalline structure of the Y-BFO thin films and the structural changes after the PEC experiments have been revealed by high resolution X-ray diffraction and transmission electron microscopy investigations. The crystalline coherence breaking due to the small ionic radius Y-addition was analyzed using Willliamson-Hall approach on the 2θ-ω scans of the symmetric (00 l) reflections and confirmed by high resolution TEM (HR-TEM) analysis...
October 25, 2018: Scientific Reports
Wanrong Geng, Xiangwei Guo, Yinlian Zhu, Yunlong Tang, Yanpeng Feng, Minjie Zou, Yujia Wang, Mengjiao Han, Jinyuan Ma, Bo Wu, Wentao Hu, Xiuliang Ma
Strongly correlated oxides exhibit multiple degrees of freedoms, which can potentially mediate exotic phases with exciting physical properties, such as the polar vortex recently found in ferroelectric oxide films. A polar vortex is stabilized by competition between charge, lattice, and/or orbital degrees of freedom, which displays vortex-ferroelectric phase transitions and emergent chirality, making it a potential candidate for designing information storage and processing devices. Here, by a combination of controlled film growth and aberration-corrected scanning transmission electron microscopy, we obtain nanoscale vortex arrays in [110]-oriented BiFeO3 films...
November 27, 2018: ACS Nano
Lan Ge, Yuhuan Xu, Lijun Ding, Fuheng You, Qian Liu, Kun Wang
Developing effective sensing method for trace analysis of ampicillin (AMP) is urgent and significant due to its residue possess serious threats to human health. Herein, a p-n heterojunction, on the basis of p-type BiFeO3 nanoparticles coupled n-typed ultrathin graphite-like carbon nitride (utg-C3 N4 ) nanosheets, has been designed and synthesized via a simple electrostatic interaction strategy. Such p-n heterojunction has two advantages: one is capable to narrow the band gap of photoactive materials from 2...
January 15, 2019: Biosensors & Bioelectronics
David Edwards, Niall Browne, Kristina M Holsgrove, Aaron B Naden, Sayed O Sayedaghaee, Bin Xu, Sergey Prosandeev, Dawei Wang, Dipanjan Mazumdar, Martial Duchamp, Arunava Gupta, Sergei V Kalinin, Miryam Arredondo, Raymond G P McQuaid, Laurent Bellaiche, J Marty Gregg, Amit Kumar
Correction for 'Giant resistive switching in mixed phase BiFeO3 via phase population control' by David Edwards et al., Nanoscale, 2018, 10, 17629-17637.
November 7, 2018: Nanoscale
José Manuel Vila-Fungueiriño, Andrés Gómez, Jordi Antoja-Lleonart, Jaume Gázquez, César Magén, Beatriz Noheda, Adrián Carretero-Genevrier
We use an original water-based chemical method to grow pure epitaxial BiFeO3 (BFO) ultra-thin films with excellent piezoelectric properties. Particularly, we show that this novel chemical route produces higher natural ferroelectric domain size distribution and coercive field compared to similar BFO films grown by physical methods. Moreover, we measured the d33 piezoelectric coefficient of 60 nm thick BFO films by a direct approach, using Direct Piezoelectric Force Microscopy (DPFM). As a result, first piezo-generated charge maps of a very thin BFO layer were obtained applying this novel technology...
November 8, 2018: Nanoscale
Yi Zhang, Haidong Lu, Lin Xie, Xingxu Yan, Tula R Paudel, Jeongwoo Kim, Xiaoxing Cheng, Hui Wang, Colin Heikes, Linze Li, Mingjie Xu, Darrell G Schlom, Long-Qing Chen, Ruqian Wu, Evgeny Y Tsymbal, Alexei Gruverman, Xiaoqing Pan
Coupling between different degrees of freedom, that is, charge, spin, orbital and lattice, is responsible for emergent phenomena in complex oxide heterostrutures1,2 . One example is the formation of a two-dimensional electron gas (2DEG) at the polar/non-polar LaAlO3 /SrTiO3 (LAO/STO)3-7 interface. This is caused by the polar discontinuity and counteracts the electrostatic potential build-up across the LAO film3 . The ferroelectric polarization at a ferroelectric/insulator interface can also give rise to a polar discontinuity8-10 ...
September 24, 2018: Nature Nanotechnology
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, Lane W Martin
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...
September 21, 2018: Nature Communications
Fajer Mushtaq, Xiangzhong Chen, Marcus Hoop, Harun Torlakcik, Eva Pellicer, Jordi Sort, Chiara Gattinoni, Bradley J Nelson, Salvador Pané
Designing new catalysts that can efficiently utilize multiple energy sources can contribute to solving the current challenges of environmental remediation and increasing energy demands. In this work, we fabricated single-crystalline BiFeO3 (BFO) nanosheets and nanowires that can successfully harness visible light and mechanical vibrations and utilize them for degradation of organic pollutants. Under visible light both BFO nanostructures displayed a relatively slow reaction rate. However, under piezocatalysis both nanosheets and nanowires exhibited higher reaction rates in comparison with photocatalytic degradation...
June 29, 2018: iScience
Yu Tian, Lanying Wei, Qinghua Zhang, Houbing Huang, Yuelin Zhang, Hua Zhou, Fengjie Ma, Lin Gu, Sheng Meng, Long-Qing Chen, Ce-Wen Nan, Jinxing Zhang
Ferroelectrics, which generate a switchable electric field across the solid-liquid interface, may provide a platform to control chemical reactions (physical properties) using physical fields (chemical stimuli). However, it is challenging to in-situ control such polarization-induced interfacial chemical structure and electric field. Here, we report that construction of chemical bonds at the surface of ferroelectric BiFeO3 in aqueous solution leads to a reversible bulk polarization switching. Combining piezoresponse (electrostatic) force microscopy, X-ray photoelectron spectroscopy, scanning transmission electron microscopy, first-principles calculations and phase-field simulations, we discover that the reversible polarization switching is ascribed to the sufficient formation of polarization-selective chemical bonds at its surface, which decreases the interfacial chemical energy...
September 18, 2018: Nature Communications
Fiza Mumtaz, G Hassnain Jaffari, S Ismat Shah
We have systematically investigated the effects of Eu substitution on chemical pressure, bond lengths, microstrain, bond angles, octahedral tilting, vibrational modes and phase transformation, in BiFeO3 . Correlation between concentration, phase, local structure and magnetism has been explained. Substitution of Eu ions with contrasting magnetic moment and dissimilar size, affects the local structure by changing bond angles and hence modifies spin structure through weakening of Dzyaloshinsky-Moriya (DM) interaction which lead to destruction of spiral spin configuration...
September 13, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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