1
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Gupta G, Kansal SK, Umar A, Akbar S. Visible-light driven excellent photocatalytic degradation of ofloxacin antibiotic using BiFeO 3 nanoparticles. Chemosphere 2023; 314:137611. [PMID: 36565766 DOI: 10.1016/j.chemosphere.2022.137611] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 11/28/2022] [Accepted: 12/17/2022] [Indexed: 06/17/2023]
Abstract
The extensive exploration of multiferroic materials for degradation of contaminants and environmental remediation is promptly strengthened because of their distinct applications. BiFeO3, a prominent class of multiferroics, have received immense attention in recent times. Present study reports the synthesis of a highly crystalline BiFeO3 via facile combustion method. The prepared catalyst was characterized using different techniques like XRD, FTIR, FESEM, EDS, XPS, DRS and PL. From DRS results, the energy band gap of BiFeO3 was computed as 2.1 eV which was suitable enough for its exploration as a visible light photocatalyst. Therefore, BiFeO3 was efficiently utilized for the degradation of ofloxacin drug under the exposure of visible light. The obtained results depicted 80% ofloxacin degradation under optimized conditions (pH 8, 0.5 g/L catalyst dose and 10 mg/L drug concentration) in 180 min. Pseudo first order kinetics was followed with rate constant 0.0097 min-1, as inferred from the kinetic studies. Furthermore, 64% TOC reduction was attained by utilizing the prepared catalyst under optimum conditions. Additionally, the photocatalytic experiments showed excellent degradation efficiency even after five cycles which demonstrated good stability of the fabricated catalyst.
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Affiliation(s)
- Girish Gupta
- Dr. SSB University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh, India
| | - Sushil K Kansal
- Dr. SSB University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh, India.
| | - Ahmad Umar
- Department of Chemistry, Faculty of Science and Arts, And Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran-11001, Saudi Arabia; Department of Materials Science and Engineering, The Ohio State University, Columbus, 43210 OH, USA.
| | - Sheikh Akbar
- Department of Materials Science and Engineering, The Ohio State University, Columbus, 43210 OH, USA
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2
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Ramesh R. Materials for a Sustainable Microelectronics Future: Electric Field Control of Magnetism with Multiferroics. J Indian Inst Sci 2022; 102:489-511. [PMID: 35035127 PMCID: PMC8749116 DOI: 10.1007/s41745-021-00277-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 11/23/2021] [Indexed: 11/30/2022]
Abstract
This article is written on behalf of many colleagues, collaborators, and researchers in the field of complex oxides as well as current and former students and postdocs who continue to enable and undertake cutting-edge research in the field of multiferroics, magnetoelectrics, and the pursuit of electric-field control of magnetism. What I present is something that is extremely exciting from both a fundamental science and applications perspective and has the potential to revolutionize our world, particularly from a sustainability perspective. To realize this potential will require numerous new innovations, both in the fundamental science arena as well as translating these scientific discoveries into real applications. Thus, this article will attempt to bridge the gap between fundamental materials physics and the actual manifestations of the physical concepts into real-life applications. I hope this article will help spur more translational research within the broad materials community.
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Affiliation(s)
- R Ramesh
- Department of Physics and Department of Materials Science and Engineering, University of California, Berkeley, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA
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3
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Bharathkumar S, Sakar M, Archana J, Navaneethan M, Balakumar S. Interfacial engineering in 3D/2D and 1D/2D bismuth ferrite (BiFeO 3)/Graphene oxide nanocomposites for the enhanced photocatalytic activities under sunlight. Chemosphere 2021; 284:131280. [PMID: 34217926 DOI: 10.1016/j.chemosphere.2021.131280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 06/11/2021] [Accepted: 06/16/2021] [Indexed: 06/13/2023]
Abstract
3D-particulate and 1D-fiber structures of multiferroic bismuth ferrite (BiFeO3/BFO) and their composites with 2D-graphene oxide (GO) have been developed to exploit the different scheme of interfacial engineering as 3D/2D and 1D/2D systems. Particulates and fibers of BFO were developed via sol-gel and electrospinning fabrication approaches respectively and their integration with GO was performed via the ultrasonic-assisted chemical reduction process. The crystalline and phase formation of BiFeO3 and GO was confirmed from the XRD patterns obtained. The electron microscopic images revealed the characteristic integration of 3D particulates (with average size of 100 nm) and 1D fibers (with diameter of ~150 nm and few μm length) onto the 2D GO layers (thickness of ~27 nm). XPS analysis revealed that the BFO nanostructures have been integrated onto the GO through chemisorptions process, where it indicated that the ultrasonic process engineers the interface through the chemical modification of the surface of these 3D/2D and 1D/2D nanostructures. The photophysical studies such as the impedance and photocurrent measurements showed that the charge separation and recombination resistance is significantly enhanced in the system, which can directly be attributed to the effective interfacial engineering in the developed hetero-morphological composites. The degradation studies against a model pollutant Rhodamine B revealed that the developed nanocomposites exhibit superior photocatalytic activity via the effective generation of OH radicals as confirmed by the radical analysis studies (100% degradation in 150 and 90 min for 15% GO/BFO particulate and fiber composites, respectively). The developed system also demonstrated excellent photocatalytic recyclability, indicated their enhanced stability.
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Affiliation(s)
- S Bharathkumar
- National Centre for Nanoscience and Nanotechnology, University of Madras, Guindy Campus, Chennai, 600 025, India; Functional Materials and Energy Device Laboratory, Department of Physics and Nanotechnology, SRM IST, Kattankulathur, Chengalpattu, 603203, India
| | - M Sakar
- National Centre for Nanoscience and Nanotechnology, University of Madras, Guindy Campus, Chennai, 600 025, India; Centre for Nano and Material Sciences, Jain University, Bangalore, 562112, Karnataka, India
| | - J Archana
- Functional Materials and Energy Device Laboratory, Department of Physics and Nanotechnology, SRM IST, Kattankulathur, Chengalpattu, 603203, India.
| | - M Navaneethan
- Functional Materials and Energy Device Laboratory, Department of Physics and Nanotechnology, SRM IST, Kattankulathur, Chengalpattu, 603203, India
| | - S Balakumar
- National Centre for Nanoscience and Nanotechnology, University of Madras, Guindy Campus, Chennai, 600 025, India.
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4
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Kopyl S, Surmenev R, Surmeneva M, Fetisov Y, Kholkin A. Magnetoelectric effect: principles and applications in biology and medicine- a review. Mater Today Bio 2021; 12:100149. [PMID: 34746734 PMCID: PMC8554634 DOI: 10.1016/j.mtbio.2021.100149] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 10/05/2021] [Accepted: 10/08/2021] [Indexed: 12/26/2022] Open
Abstract
Magnetoelectric (ME) effect experimentally discovered about 60 years ago remains one of the promising research fields with the main applications in microelectronics and sensors. However, its applications to biology and medicine are still in their infancy. For the diagnosis and treatment of diseases at the intracellular level, it is necessary to develop a maximally non-invasive way of local stimulation of individual neurons, navigation, and distribution of biomolecules in damaged cells with relatively high efficiency and adequate spatial and temporal resolution. Recently developed ME materials (composites), which combine elastically coupled piezoelectric (PE) and magnetostrictive (MS) phases, have been shown to yield very strong ME effects even at room temperature. This makes them a promising toolbox for solving many problems of modern medicine. The main ME materials, processing technologies, as well as most prospective biomedical applications will be overviewed, and modern trends in using ME materials for future therapies, wireless power transfer, and optogenetics will be considered.
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Affiliation(s)
- S. Kopyl
- Department of Physics & CICECO - Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal
| | - R. Surmenev
- Physical Materials Science and Composite Materials Centre, Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Tomsk, Russia
- Piezo- and Magnetoelectric Materials Research & Development Centre, Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Tomsk, Russia
| | - M. Surmeneva
- Physical Materials Science and Composite Materials Centre, Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Tomsk, Russia
- Piezo- and Magnetoelectric Materials Research & Development Centre, Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Tomsk, Russia
| | - Y. Fetisov
- Research & Education Centre ‘Magnetoelectric Materials and Devices’, MIREA – Russian Technological University, Moscow, Russia
| | - A. Kholkin
- Department of Physics & CICECO - Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal
- Piezo- and Magnetoelectric Materials Research & Development Centre, Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Tomsk, Russia
- School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russia
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5
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Ma XY, Lyu HY, Hao KR, Zhao YM, Qian X, Yan QB, Su G. Large family of two-dimensional ferroelectric metals discovered via machine learning. Sci Bull (Beijing) 2021; 66:233-242. [PMID: 36654328 DOI: 10.1016/j.scib.2020.09.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/03/2020] [Accepted: 09/01/2020] [Indexed: 01/20/2023]
Abstract
Ferroelectricity and metallicity are usually believed not to coexist because conducting electrons would screen out static internal electric fields. In 1965, Anderson and Blount proposed the concept of "ferroelectric metal", however, it is only until recently that very rare ferroelectric metals were reported. Here, by combining high-throughput ab initio calculations and data-driven machine learning method with new electronic orbital based descriptors, we systematically investigated a large family (2964) of two-dimensional (2D) bimetal phosphates, and discovered 60 stable ferroelectrics with out-of-plane polarization, including 16 ferroelectric metals and 44 ferroelectric semiconductors that contain seven multiferroics. The ferroelectricity origins from spontaneous symmetry breaking induced by the opposite displacements of bimetal atoms, and the full-d-orbital coinage metal elements cause larger displacements and polarization than other elements. For 2D ferroelectric metals, the odd electrons per unit cell without spin polarization may lead to a half-filled energy band around Fermi level and is responsible for the metallicity. It is revealed that the conducting electrons mainly move on a single-side surface of the 2D layer, while both the ionic and electric contributions to polarization come from the other side and are vertical to the above layer, thereby causing the coexistence of metallicity and ferroelectricity. Van der Waals heterostructures based on ferroelectric metals may enable the change of Schottky barrier height or the Schottky-Ohmic contact type and induce a dramatic change of their vertical transport properties. Our work greatly expands the family of 2D ferroelectric metals and will spur further exploration of 2D ferroelectric metals.
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Affiliation(s)
- Xing-Yu Ma
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hou-Yi Lyu
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kuan-Rong Hao
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi-Ming Zhao
- Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaofeng Qian
- Department of Materials Science and Engineering, College of Engineering and College of Science, Texas A&M University, College Station, TX 77843, USA
| | - Qing-Bo Yan
- Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Gang Su
- Kavli Institute for Theoretical Sciences, and CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China; School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
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6
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Tu Z, Wu M. Ultrahigh-strain ferroelasticity in two-dimensional honeycomb monolayers: from covalent to metallic bonding. Sci Bull (Beijing) 2020; 65:147-52. [PMID: 36659078 DOI: 10.1016/j.scib.2019.11.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 10/19/2019] [Accepted: 11/01/2019] [Indexed: 01/21/2023]
Abstract
We propose a possible ferroelastic switching pathway of two-dimensional (2D) honeycomb lattice (including graphene, BN, stanene, etc.) that may swap its armchair and zigzag direction, reversing an unprecedented strain of 73.2%. Our ab initio calculations reveal that such pathway cannot work in covalent systems like graphene and BN; for monolayer with metallic bonds like stanene, stanane and InBi that have all been synthesized, however, such pathway can be feasible with a low switching barrier (<0.15 eV) and stress (<graphene upon 1% tensile strain), also with the highest energy/stress point in the elastic region. Their distinct behaviors are attributed to the different feature of covalent bonds and metallic bonds: the former is rigid with directionality, while the latter is malleable with ductility. A general trend of linear decrease in switching barrier with uprising metallicity for the same group compounds is revealed. Similar behaviors can be extended to bulk zinc-blended or wurtzite structure that can be deemed as multilayer stacking of buckled monolayer. Binary compounds like InBi monolayer are even multiferroics with both in-plane and vertical ferroelectricity as well as nontrivial topological properties.
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7
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Lo Conte R, Xiao Z, Chen C, Stan CV, Gorchon J, El-Ghazaly A, Nowakowski ME, Sohn H, Pattabi A, Scholl A, Tamura N, Sepulveda A, Carman GP, Candler RN, Bokor J. Influence of Nonuniform Micron-Scale Strain Distributions on the Electrical Reorientation of Magnetic Microstructures in a Composite Multiferroic Heterostructure. Nano Lett 2018; 18:1952-1961. [PMID: 29481758 DOI: 10.1021/acs.nanolett.7b05342] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Composite multiferroic systems, consisting of a piezoelectric substrate coupled with a ferromagnetic thin film, are of great interest from a technological point of view because they offer a path toward the development of ultralow power magnetoelectric devices. The key aspect of those systems is the possibility to control magnetization via an electric field, relying on the magneto-elastic coupling at the interface between the piezoelectric and the ferromagnetic components. Accordingly, a direct measurement of both the electrically induced magnetic behavior and of the piezo-strain driving such behavior is crucial for better understanding and further developing these materials systems. In this work, we measure and characterize the micron-scale strain and magnetic response, as a function of an applied electric field, in a composite multiferroic system composed of 1 and 2 μm squares of Ni fabricated on a prepoled [Pb(Mg1/3Nb2/3)O3]0.69-[PbTiO3]0.31 (PMN-PT) single crystal substrate by X-ray microdiffraction and X-ray photoemission electron microscopy, respectively. These two complementary measurements of the same area on the sample indicate the presence of a nonuniform strain which strongly influences the reorientation of the magnetic state within identical Ni microstructures along the surface of the sample. Micromagnetic simulations confirm these experimental observations. This study emphasizes the critical importance of surface and interface engineering on the micron-scale in composite multiferroic structures and introduces a robust method to characterize future devices on these length scales.
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Affiliation(s)
- Roberto Lo Conte
- Department of Electrical Engineering and Computer Science , University of California , Berkeley , California 94720 , United States
| | - Zhuyun Xiao
- Department of Electrical Engineering , University of California , Los Angeles , California 90095 , United States
| | - Cai Chen
- Department of Mechanical and Aerospace Engineering , University of California , Los Angeles , California 90095 , United States
| | - Camelia V Stan
- Advanced Light Source , Lawrence Berkeley National Lab , Berkeley , California 94720 , United States
| | - Jon Gorchon
- Department of Electrical Engineering and Computer Science , University of California , Berkeley , California 94720 , United States
- Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Amal El-Ghazaly
- Department of Electrical Engineering and Computer Science , University of California , Berkeley , California 94720 , United States
| | - Mark E Nowakowski
- Department of Electrical Engineering and Computer Science , University of California , Berkeley , California 94720 , United States
| | - Hyunmin Sohn
- Department of Electrical Engineering , University of California , Los Angeles , California 90095 , United States
| | - Akshay Pattabi
- Department of Electrical Engineering and Computer Science , University of California , Berkeley , California 94720 , United States
| | - Andreas Scholl
- Advanced Light Source , Lawrence Berkeley National Lab , Berkeley , California 94720 , United States
| | - Nobumichi Tamura
- Advanced Light Source , Lawrence Berkeley National Lab , Berkeley , California 94720 , United States
| | - Abdon Sepulveda
- Department of Mechanical and Aerospace Engineering , University of California , Los Angeles , California 90095 , United States
| | - Gregory P Carman
- Department of Mechanical and Aerospace Engineering , University of California , Los Angeles , California 90095 , United States
| | - Robert N Candler
- Department of Electrical Engineering , University of California , Los Angeles , California 90095 , United States
- Department of Mechanical and Aerospace Engineering , University of California , Los Angeles , California 90095 , United States
- California NanoSystems Institute , Los Angeles , California 90095 , United States
| | - Jeffrey Bokor
- Department of Electrical Engineering and Computer Science , University of California , Berkeley , California 94720 , United States
- Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
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8
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Cazorla C, Diéguez O, Íñiguez J. Multiple structural transitions driven by spin-phonon couplings in a perovskite oxide. Sci Adv 2017; 3:e1700288. [PMID: 28695196 PMCID: PMC5493420 DOI: 10.1126/sciadv.1700288] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 05/12/2017] [Indexed: 06/07/2023]
Abstract
Spin-phonon interactions are central to many interesting phenomena, ranging from superconductivity to magnetoelectric effects. However, they are believed to have a negligible influence on the structural behavior of most materials. For example, magnetic perovskite oxides often undergo structural transitions accompanied by magnetic signatures whose minuteness suggests that the underlying spin-phonon couplings are largely irrelevant. We present an exception to this rule, showing that novel effects can occur as a consequence. Our first-principles calculations reveal that spin-phonon interactions are essential to reproduce the experimental observations on the phase diagram of magnetoelectric multiferroic BiCoO3. Moreover, we predict that, under compression, these couplings lead to an unprecedented temperature-driven double-reentrant sequence of ferroelectric transitions. We propose how to modify BiCoO3 via chemical doping to reproduce such marked effects under ambient conditions, thereby yielding useful multifunctionality.
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Affiliation(s)
- Claudio Cazorla
- School of Materials Science and Engineering and Integrated Materials Design Centre, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Oswaldo Diéguez
- Department of Materials Science and Engineering, Faculty of Engineering, and The Raymond and Beverly Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, IL-69978 Tel Aviv, Israel
| | - Jorge Íñiguez
- Materials Research and Technology Department, Luxembourg Institute of Science and Technology, 5 avenue des Hauts-Fourneaux, L-4362 Esch/Alzette, Luxembourg
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9
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Abstract
Ultrathin multiferroics with coupled ferroelectric and ferromagnetic order parameters hold promise for novel technological paradigms, such as extremely thin magnetoelectric memories. However, these ferroic orders and their functions inevitably disappear below a fundamental size limit of several nanometers. Herein, we propose a novel design strategy for nanoscale multiferroics smaller than the critical size limit by engineering the dislocations in nonmagnetic ferroelectrics, even though these lattice defects are generally believed to be detrimental. First-principles calculations demonstrate that Ti-rich PbTiO3 dislocations exhibit magnetism due to the local nonstoichiometry intrinsic to the core structures. Highly localized spin moments in conjunction with the host ferroelectricity enable these dislocations to function as atomic-scale multiferroic channels with a pronounced magnetoelectric effect that are associated with the antiferromagnetic-ferromagnetic-nonmagnetic phase transitions in response to polarization switching. The present results thus suggest a new field of dislocation (or defect) engineering for the fabrication of ultrathin magnetoelectric multiferroics and ultrahigh density electronic devices.
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Affiliation(s)
- Takahiro Shimada
- Department of Mechanical Engineering and Science, Kyoto University , Nishikyo-ku, Kyoto 615-8540, Japan
| | - Tao Xu
- Department of Mechanical Engineering and Science, Kyoto University , Nishikyo-ku, Kyoto 615-8540, Japan
| | - Yasumitsu Araki
- Department of Mechanical Engineering and Science, Kyoto University , Nishikyo-ku, Kyoto 615-8540, Japan
| | - Jie Wang
- Department of Engineering Mechanics, School of Aeronautics and Astronautics, Zhejiang University , Hangzhou 310027, China
| | - Takayuki Kitamura
- Department of Mechanical Engineering and Science, Kyoto University , Nishikyo-ku, Kyoto 615-8540, Japan
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10
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Tan GL, Sheng HH. Multiferroic La 0.2Pb 0.7Fe 12O 19 ceramics: Ferroelectricity, ferromagnetism and colossal magneto-capacitance effect. Data Brief 2016; 10:69-74. [PMID: 27942571 PMCID: PMC5137171 DOI: 10.1016/j.dib.2016.11.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 10/09/2016] [Accepted: 11/17/2016] [Indexed: 11/30/2022] Open
Abstract
The mutual control of the electric and magnetic properties of a multiferroic solid is of fundamental and great technological importance. In this article, the synthesis procedure of La0.2Pb0.7Fe12O19 ceramics was briefly described and the data acquired for the materials characterization is presented. This data article is related to the research article-Acta Mater. 2016, 121, 144 (j.actamat.2016.08.083). Electric polarization hysteresis loop and I-V curve, which help to confirm the ferroelectricity of La0.2Pb0.7Fe12O19 ceramics, were presented. Strong magnetic polarization data was also presented. The great variation of the dielectric constants along with the magnetic field has been presented which helped to demonstrat the giant magnetocapacitance of La0.2Pb0.7Fe12O19. All the datasets were collected at room temperature. Large ferroelectricity, strong magnetism and colossal magneto-capacitance effect have been all realized in one single phase La0.2Pb0.7Fe12O19 at room temperature.
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11
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Jartych E, Pikula T, Kowal K, Dzik J, Guzdek P, Czekaj D. Magnetoelectric Effect in Ceramics Based on Bismuth Ferrite. Nanoscale Res Lett 2016; 11:234. [PMID: 27129686 PMCID: PMC4851679 DOI: 10.1186/s11671-016-1436-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 04/14/2016] [Indexed: 06/05/2023]
Abstract
Solid-state sintering method was used to prepare ceramic materials based on bismuth ferrite, i.e., (BiFeO3)1 - x -(BaTiO3) x and Bi1 - x Nd x FeO3 solid solutions and the Aurivillius Bi5Ti3FeO15 compound. The structure of the materials was examined using X-ray diffraction, and the Rietveld method was applied to phase analysis and structure refinement. Magnetoelectric coupling was registered in all the materials using dynamic lock-in technique. The highest value of magnetoelectric coupling coefficient α ME was obtained for the Bi5Ti3FeO15 compound (α ME ~ 10 mVcm(-1) Oe(-1)). In the case of (BiFeO3)1 - x -(BaTiO3) x and Bi1 - x Nd x FeO3 solid solutions, the maximum α ME is of the order of 1 and 2.7 mVcm(-1) Oe(-1), respectively. The magnitude of magnetoelectric coupling is accompanied with structural transformation in the studied solid solutions. The relatively high magnetoelectric effect in the Aurivillius Bi5Ti3FeO15 compound is surprising, especially since the material is paramagnetic at room temperature. When the materials were subjected to a preliminary electrical poling, the magnitude of the magnetoelectric coupling increased 2-3 times.
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Affiliation(s)
- Elżbieta Jartych
- Institute of Electronics and Information Technology, Lublin University of Technology, Nadbystrzycka 38a Str., 20-618, Lublin, Poland.
| | - Tomasz Pikula
- Institute of Electronics and Information Technology, Lublin University of Technology, Nadbystrzycka 38a Str., 20-618, Lublin, Poland
| | - Karol Kowal
- Institute of Electronics and Information Technology, Lublin University of Technology, Nadbystrzycka 38a Str., 20-618, Lublin, Poland
| | - Jolanta Dzik
- Institute of Technology and Mechatronics, University of Silesia, Żytnia 12 Str., 41-200, Sosnowiec, Poland
| | - Piotr Guzdek
- Institute of Electron Technology, Cracow Division, Zabłocie 39 Str., 30-701, Kraków, Poland
| | - Dionizy Czekaj
- Institute of Technology and Mechatronics, University of Silesia, Żytnia 12 Str., 41-200, Sosnowiec, Poland
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12
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Abstract
Engineering defects and strains in oxides provides a promising route for the quest of thin film materials with coexisting ferroic orders, multiferroics, with efficient magnetoelectric coupling at room temperature. Precise control of the strain gradient would enable custom tailoring of the multiferroic properties but presently remains challenging. Here we explore the existence of a polar-graded state in epitaxially strained antiferromagnetic SrMnO3 thin films, whose polar nature was predicted theoretically and recently demonstrated experimentally. By means of aberration-corrected scanning transmission electron microscopy we map the polar rotation of the ferroelectric polarization with atomic resolution, both far from and near the domain walls, and find flexoelectricity resulting from vertical strain gradients. The origin of this particular strain state is a gradual distribution of oxygen vacancies across the film thickness, according to electron energy loss spectroscopy. Herein we present a chemistry-mediated route to induce polar rotations in oxygen-deficient multiferroic films, resulting in flexoelectric polar rotations and with potentially enhanced piezoelectricity.
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Affiliation(s)
- Roger Guzmán
- Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza , 50018 Zaragoza, Spain
| | - Laura Maurel
- Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza , 50018 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza , 50009 Zaragoza, Spain
| | - Eric Langenberg
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC , 50009 Zaragoza, Spain
| | - Andrew R Lupini
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Pedro A Algarabel
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC , 50009 Zaragoza, Spain
| | - José A Pardo
- Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza , 50018 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza , 50018 Zaragoza, Spain
- Departamento de Ciencia y Tecnología de Materiales y Fluidos, Universidad de Zaragoza , 50018 Zaragoza, Spain
| | - César Magén
- Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza , 50018 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza , 50009 Zaragoza, Spain
- Fundación ARAID , 50004 Zaragoza, Spain
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Lv F, Zhang J, Gao C, Ma L, Gao D, Zhou S, Xue D. Hydrothermal epitaxy and resultant properties of EuTiO3 films on SrTiO3(001) substrate. Nanoscale Res Lett 2014; 9:266. [PMID: 24948889 PMCID: PMC4048538 DOI: 10.1186/1556-276x-9-266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 05/19/2014] [Indexed: 06/03/2023]
Abstract
UNLABELLED We report a novel epitaxial growth of EuTiO3 films on SrTiO3(001) substrate by hydrothermal method. The morphological, structural, chemical, and magnetic properties of these epitaxial EuTiO3 films were examined by scanning electron microscopy, transmission electron microscopy, high-resolution X-ray diffractometry, X-ray photoelectron spectroscopy, and superconducting quantum interference device magnetometry, respectively. As-grown EuTiO3 films with a perovskite structure were found to show an out-of-plane lattice shrinkage and room-temperature ferromagnetism, possibly resulting from an existence of Eu(3+). Postannealing at 1,000°C could reduce the amount of Eu(3+), relax the out-of-plane lattice shrinkage, and impact the magnetic properties of the films. PACS 81.10.Aj; 81.15.-z; 61.05.-a.
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Affiliation(s)
- Fengzhen Lv
- Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China
| | - Jing Zhang
- Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China
| | - Cunxu Gao
- Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China
| | - Li Ma
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Daqiang Gao
- Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China
| | - Shiming Zhou
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Desheng Xue
- Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China
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Yang Q, Zhang W, Yuan M, Kang L, Feng J, Pan W, Ouyang J. Preparation and characterization of self-assembled percolative BaTiO 3-CoFe 2O 4 nanocomposites via magnetron co-sputtering. Sci Technol Adv Mater 2014; 15:025003. [PMID: 27877664 PMCID: PMC5090415 DOI: 10.1088/1468-6996/15/2/025003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 02/14/2013] [Accepted: 12/12/2013] [Indexed: 05/21/2023]
Abstract
BaTiO3-CoFe2O4 composite films were prepared on (100) SrTiO3 substrates by using a radio-frequency magnetron co-sputtering method at 750 °C. These films contained highly (001)-oriented crystalline phases of perovskite BaTiO3 and spinel CoFe2O4, which can form a self-assembled nanostructure with BaTiO3 well-dispersed into CoFe2O4 under optimized sputtering conditions. A prominent dielectric percolation behavior was observed in the self-assembled nanocomposite. Compared with pure BaTiO3 films sputtered under similar conditions, the nanocomposite film showed higher dielectric constants and lower dielectric losses together with a dramatically suppressed frequency dispersion. This dielectric percolation phenomenon can be explained by the 'micro-capacitor' model, which was supported by measurement results of the electric polarization and leakage current.
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Affiliation(s)
- Qian Yang
- Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
| | - Wei Zhang
- Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
| | - Meiling Yuan
- Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
| | - Limin Kang
- Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
| | - Junxiao Feng
- Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
| | - Wei Pan
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Jun Ouyang
- Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
- Suzhou Institute of Shandong University, Suzhou, 215123, China
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