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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.
October 11, 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...
September 27, 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
Lijing Di, Hua Yang, Tao Xian, Xiujuan Chen
In this work, Ag3 PO4 microparticles were decorated onto the surface of BiFeO3 microcuboids through a precipitation method to obtain p-Ag3 PO4 /n-BiFeO3 heterojunction composites. The composites were employed for the degradation of acid orange 7 (AO7) under visible-light irradiation. It is found that the composites exhibit much higher photocatalytic efficiency than bare BiFeO3 . Meanwhile, the intrinsical visible-light-driven photocatalytic activity of Ag3 PO4 /BiFeO3 composites was further confirmed by the degradation of phenol...
August 29, 2018: Nanoscale Research Letters
Yafei Hou, Renlu Han, Weiping Li, Laihui Luo, Weidong Fei
With the increasing demand of high energy density dielectric films, macrostructure design, for instance the construction of sandwich-structured films, has been attracting much attention due to its promise in raising the discharge energy density along with an enhanced electric breakdown strength. However, the contrast of dielectric constants between neighboring layers plays a dominate role in the distribution of the electric field, which might decrease the electric breakdown strength, and has attracted little attention up to now...
August 29, 2018: Physical Chemistry Chemical Physics: PCCP
H Wang, Z R Liu, H Y Yoong, T R Paudel, J X Xiao, R Guo, W N Lin, P Yang, J Wang, G M Chow, T Venkatesan, E Y Tsymbal, H Tian, J S Chen
Out-of-plane ferroelectricity with a high transition temperature in nanometer-scale films is required to miniaturize electronic devices. Direct visualization of stable ferroelectric polarization and its switching behavior in atomically thick films is critical for achieving this goal. Here, ferroelectric order at room temperature in the two-dimensional limit is demonstrated in tetragonal BiFeO3 ultrathin films. Using aberration-corrected scanning transmission electron microscopy, we directly observed robust out-of-plane spontaneous polarization in one-unit-cell-thick BiFeO3 films...
August 20, 2018: Nature Communications
Haoxin Mai, Teng Lu, Qian Li, Qingbo Sun, Khu Vu, Hua Chen, Genmiao Wang, Mark G Humphrey, Felipe Kremer, Li Li, Ray L Withers, Yun Liu
In this report, a ferroelectric-luminescent heterostructure is designed to convert infrared light into electric power. We use BiFeO3 (BFO) as the ferroelectric layer and Y2 O3 :Yb,Tm (YOT) as the upconversion layer. Different from conventional ferroelectric materials, this heterostructure exhibits switchable and stable photovoltaic effects under 980 nm illumination, whose energy is much lower than the band gap of BFO. The energy transfer mechanism in this heterostructure is therefore studied carefully. It is found that a highly efficient nonradiative energy transfer process from YOT to BFO plays a critical role in achieving the below-band-gap photon-excited photovoltaic effects in this heterostructure...
September 5, 2018: ACS Applied Materials & Interfaces
Jhih-Wei Chen, Shun-Tsung Lo, Sheng-Chin Ho, Sheng-Shong Wong, Thi-Hai-Yen Vu, Xin-Quan Zhang, Yi-De Liu, Yu-You Chiou, Yu-Xun Chen, Jan-Chi Yang, Yi-Chun Chen, Ying-Hao Chu, Yi-Hsien Lee, Chung-Jen Chung, Tse-Ming Chen, Chia-Hao Chen, Chung-Lin Wu
Interest in bringing p- and n-type monolayer semiconducting transition metal dichalcogenides (TMD) into contact to form rectifying pn diode has thrived since it is crucial to control the electrical properties in two-dimensional (2D) electronic and optoelectronic devices. Usually this involves vertically stacking different TMDs with pn heterojunction or, laterally manipulating carrier density by gate biasing. Here, by utilizing a locally reversed ferroelectric polarization, we laterally manipulate the carrier density and created a WSe2 pn homojunction on the supporting ferroelectric BiFeO3 substrate...
August 7, 2018: Nature Communications
Linze Li, Jacob R Jokisaari, Yi Zhang, Xiaoxing Cheng, Xingxu Yan, Colin Heikes, Qiyin Lin, Chaitanya Gadre, Darrell G Schlom, Long-Qing Chen, Xiaoqing Pan
Domain walls (DWs) have become an essential component in nanodevices based on ferroic thin films. The domain configuration and DW stability, however, are strongly dependent on the boundary conditions of thin films, which make it difficult to create complex ordered patterns of DWs. Here, it is shown that novel domain structures, that are otherwise unfavorable under the natural boundary conditions, can be realized by utilizing engineered nanosized structural defects as building blocks for reconfiguring DW patterns...
September 2018: Advanced Materials
M A Basith, Ragib Ahsan, Ishrat Zarin, M A Jalil
A comprehensive comparison between BiFeO3 -reduced graphene oxide (rGO) nanocomposite and Bi25 FeO40 -rGO nanocomposite has been performed to investigate their photocatalytic abilities in degradation of Rhodamine B dye and generation of hydrogen by water-splitting. The hydrothermal technique adapted for synthesis of the nanocomposites provides a versatile temperature-controlled phase selection between perovskite BiFeO3 and sillenite Bi25 FeO40 . Both perovskite and sillenite structured nanocomposites are stable and exhibit considerably higher photocatalytic ability over pure BiFeO3 nanoparticles and commercially available Degussa P25 titania...
July 23, 2018: Scientific Reports
Ji Ma, Jing Ma, Qinghua Zhang, Renci Peng, Jing Wang, Chen Liu, Meng Wang, Ning Li, Mingfeng Chen, Xiaoxing Cheng, Peng Gao, Lin Gu, Long-Qing Chen, Pu Yu, Jinxing Zhang, Ce-Wen Nan
Charged domain walls in ferroelectrics exhibit a quasi-two-dimensional conduction path coupled to the surrounding polarization. They have been proposed for use as non-volatile memory with non-destructive operation and ultralow energy consumption. Yet the evolution of domain walls during polarization switching makes it challenging to control their location and conductance precisely, a prerequisite for controlled read-write schemes and for integration in scalable memory devices. Here, we explore and reversibly switch the polarization of square BiFeO3 nanoislands in a self-assembled array...
October 2018: Nature Nanotechnology
Ayan Mukherjee, Sankalpita Chakrabarty, Neetu Kumari, Wei-Nien Su, Suddhasatwa Basu
Reduced graphene oxide (RGO)-supported bismuth ferrite (BiFeO3 ) (RGO-BFO) nanocomposite is synthesized via a two-step chemical route for photoelectrochemical (PEC) water splitting and photocatalytic dye degradation. The detailed structural analysis, chemical coupling, and morphology of BFO- and RGO-supported BFO are established through X-ray diffraction, Raman and X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy studies. The modified band structure in RGO-BFO is obtained from the UV-vis spectroscopy study and supported by density functional theory (DFT)...
June 30, 2018: ACS Omega
Gareth Clarke, Andrii Rogov, Sarah McCarthy, Luigi Bonacina, Yurii Gun'ko, Christine Galez, Ronan Le Dantec, Yuri Volkov, Yannick Mugnier, Adriele Prina-Mello
We present two new synthetic routes for bismuth ferrite harmonic nanoparticles (BiFeO3 HNPs). Both phase-pure and mixed phase BiFeO3 materials were produced after improvement of the solvent evaporation and sol-gel combustion routes. Metal nitrates with a series of dicarboxylic acids (tartronic, tartaric and mucic) were used to promote crystallization. We found that the longer the carbon backbone with a hydroxyl group attached to each carbon, the lower the annealing temperature. We also demonstrate that nanocrystals more readily formed at a given temperature by adding glycerol but to the detriment of phase purity, whereas addition of NaCl in excess with mucic acid promotes the formation of phase-pure, monocrystalline nanoparticles...
July 11, 2018: Scientific Reports
Lu You, Fan Zheng, Liang Fang, Yang Zhou, Liang Z Tan, Zeyu Zhang, Guohong Ma, Daniel Schmidt, Andrivo Rusydi, Le Wang, Lei Chang, Andrew M Rappe, Junling Wang
Ferroelectric materials for photovoltaics have sparked great interest because of their switchable photoelectric responses and above-bandgap photovoltages that violate conventional photovoltaic theory. However, their relatively low photocurrent and power conversion efficiency limit their potential application in solar cells. To improve performance, conventional strategies focus mainly on narrowing the bandgap to better match the solar spectrum, leaving the fundamental connection between polar order and photovoltaic effect largely overlooked...
July 2018: Science Advances
Hyeon Han, Donghoon Kim, Sangmin Chae, Jucheol Park, Sang Yeol Nam, Mingi Choi, Kijung Yong, Hyo Jung Kim, Junwoo Son, Hyun Myung Jang
Ferroelectric photovoltaics (FPVs) have drawn much attention owing to their high stability, environmental safety, and anomalously high photovoltages, coupled with reversibly switchable photovoltaic responses. However, FPVs suffer from extremely low photocurrents, which is primarily due to their wide band gaps. Here, we present a new class of FPVs by demonstrating switchable ferroelectric photovoltaic effects and narrow band-gap properties using hexagonal ferrite (h-RFeO3) thin films, where R denotes rare-earth ions...
July 13, 2018: Nanoscale
Junxiang Yao, Xiao Song, Xingsen Gao, Guo Tian, Peilian Li, Hua Fan, Zhifeng Huang, Wenda Yang, Deyang Chen, Zhen Fan, Min Zeng, Jun-Ming Liu
Electrically driven magnetic switching (EDMS) is highly demanded for next-generation advanced memories or spintronic devices. The key challenge is to achieve repeatable and reversible EDMS at sufficiently small scale. In this work, we reported an experimental realization of room-temperature, electrically driven, reversible, and robust 120° magnetic state rotation in nanoscale multiferroic heterostructures consisting of a triangular Co nanomagnet array on tetragonal BiFeO3 films, which can be directly monitored by magnetic force microscope (MFM) imaging...
July 24, 2018: ACS Nano
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