1
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Su T, Yu Y, Ross CA. Directed Self-Assembly of Oxide Nanocomposites by Ion-Beam Lithography. NANO LETTERS 2024; 24:195-201. [PMID: 38117033 DOI: 10.1021/acs.nanolett.3c03703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Vertically aligned self-assembled nanocomposite films have provided a unique platform to study magnetoelectric effects and other forms of coupling between complex oxides. However, the distribution in the locations and sizes of the phase-separated nanostructures limits their utility. In this work, we demonstrate a process to template the locations of the self-assembled structure using ion lithography, which is effective for general insulating substrates. This process was used to produce a nanocomposite consisting of fin-shaped vertical nanostructures of ferroelectric BiFeO3 and ferrimagnetic CoFe2O4 with a feature size of 100 nm on (111)-oriented SrTiO3 substrates. Cross-sectional imaging of the three-phase perovskite-spinel-substrate epitaxial interface reveals the selective nucleation of CoFe2O4 in the trenches of the patterned substrate, and the magnetic domains of CoFe2O4 were manipulated by applying an external magnetic field.
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Affiliation(s)
- Tingyu Su
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Yang Yu
- International Applications Center, Raith America, Inc., Troy, New York 12180, United States
| | - Caroline A Ross
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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2
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MacManus-Driscoll JL, Wu R, Li W. Interface-related phenomena in epitaxial complex oxide ferroics across different thin film platforms: opportunities and challenges. MATERIALS HORIZONS 2023; 10:1060-1086. [PMID: 36815609 PMCID: PMC10068909 DOI: 10.1039/d2mh01527g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Interfaces in complex oxides give rise to fascinating new physical phenomena arising from the interconnected spin, lattice, charge and orbital degrees of freedom. Most commonly, interfaces are engineered in epitaxial superlattice films. Of growing interest also are epitaxial vertically aligned nanocomposite films where interfaces form by self-assembly. These two thin film forms offer different capabilities for materials tuning and have been explored largely separately from one another. Ferroics (ferroelectric, ferromagnetic, multiferroic) are among the most fascinating phenomena to be manipulated using interface effects. Hence, in this review we compare and contrast the ferroic properties that arise in these two different film forms, highlighting exemplary materials combinations which demonstrate novel, enhanced and/or emergent ferroic functionalities. We discuss the origins of the observed functionalities and propose where knowledge can be translated from one materials form to another, to potentially produce new functionalities. Finally, for the two different film forms we present a perspective on underexplored/emerging research directions.
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Affiliation(s)
| | - Rui Wu
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
- Spin-X Institute, School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, South China University of Technology, Guangzhou 511442, China
| | - Weiwei Li
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
- MIIT Key Laboratory of Aerospace Information Materials and Physics, State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
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3
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Ahlawat A, Khan AA, Deshmukh P, Bhartiya S, Satapathy S, Shirolkar MM, Wang H, Choudhary RJ. Strain assisted magnetoelectric coupling in ordered nanomagnets of CoFe 2O 4/SrRuO 3/(Pb(Mg 1/3Nb 2/3)O 3-PbTiO 3) heterostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:305801. [PMID: 35561671 DOI: 10.1088/1361-648x/ac6fa6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 05/13/2022] [Indexed: 06/15/2023]
Abstract
We have explored the electric field controlled magnetization in the nanodot CoFe2O4/SrRuO3/PMN-PT (CFO/SRO/PMN-PT) heterostructures. Ordered ferromagnetic CFO nanodots (∼300 nm lateral dimension) are developed on the PMN-PT substrate (ferroelectric as well as piezoelectric) using a nanostencil-mask pattering method during pulsed laser deposition. The nanostructures reveal electric field induced magnetization reversal in the single domain CFO nanodots through transfer of piezostrains from the piezoelectric PMN-PT substrate to the CFO. Further, electric field modulated spin structure of CFO nanomagnets is analyzed by using x-ray magnetic circular dichroism (XMCD). The XMCD analysis reveals cations (Fe3+/Co2+) redistribution on the octahedral and tetrahedral site in the electric field poled CFO nanodots, establishing the strain induced magneto-electric coupling effects. The CFO/SRO/PMN-PT nanodots structure demonstrate multilevel switching of ME coupling coefficient (α) by applying selective positive and negative electric fields in a non-volatile manner. The retention of two stable states ofαis illustrated for ∼106seconds, which can be employed to store the digital data in non-volatile memory devices. Thus the voltage controlled magnetization in the nanodot structures leads a path towards the invention of energy efficient high-density memory devices.
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Affiliation(s)
- Anju Ahlawat
- UGC-DAE Consortium for Scientific Research, Indore, India
| | - Azam Ali Khan
- Laser Biomedical Applications Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India
- HomiBhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India
| | - Pratik Deshmukh
- Laser Biomedical Applications Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India
- HomiBhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India
| | - Sushmita Bhartiya
- Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India
| | - S Satapathy
- Laser Biomedical Applications Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India
- HomiBhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India
| | - Mandar M Shirolkar
- Symbiosis Center for Nanoscience and Nanotechnology (SCNN), Symbiosis International (Deemed University) (SIU), Lavale, Pune 412115, Maharashtra, India
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Haiqian Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - R J Choudhary
- UGC-DAE Consortium for Scientific Research, Indore, India
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4
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Chen A, Dai Y, Eshghinejad A, Liu Z, Wang Z, Bowlan J, Knall E, Civale L, MacManus‐Driscoll JL, Taylor AJ, Prasankumar RP, Lookman T, Li J, Yarotski D, Jia Q. Competing Interface and Bulk Effect-Driven Magnetoelectric Coupling in Vertically Aligned Nanocomposites. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1901000. [PMID: 31592418 PMCID: PMC6774036 DOI: 10.1002/advs.201901000] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/11/2019] [Indexed: 05/31/2023]
Abstract
Room-temperature magnetoelectric (ME) coupling is developed in artificial multilayers and nanocomposites composed of magnetostrictive and electrostrictive materials. While the coupling mechanisms and strengths in multilayers are widely studied, they are largely unexplored in vertically aligned nanocomposites (VANs), even though theory has predicted that VANs exhibit much larger ME coupling coefficients than multilayer structures. Here, strong transverse and longitudinal ME coupling in epitaxial BaTiO3:CoFe2O4 VANs measured by both optical second harmonic generation and piezoresponse force microscopy under magnetic fields is reported. Phase field simulations have shown that the ME coupling strength strongly depends on the vertical interfacial area which is ultimately controlled by pillar size. The ME coupling in VANs is determined by the competition between the vertical interface coupling effect and the bulk volume conservation effect. The revealed mechanisms shed light on the physical insights of vertical interface coupling in VANs in general, which can be applied to a variety of nanocomposites with different functionalities beyond the studied ME coupling effect.
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Affiliation(s)
- Aiping Chen
- Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosNM87545USA
| | - Yaomin Dai
- Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosNM87545USA
| | - Ahmad Eshghinejad
- Department of Mechanical EngineeringUniversity of WashingtonSeattleWA98195USA
| | - Zhen Liu
- Theoretical DivisionLos Alamos National LaboratoryLos AlamosNM87545USA
| | - Zhongchang Wang
- Department of Quantum and Energy MaterialsInternational Iberian Nanotechnology LaboratoryBraga4715‐330Portugal
| | - John Bowlan
- Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosNM87545USA
| | - Erik Knall
- Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosNM87545USA
| | | | - Judith L. MacManus‐Driscoll
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage Rd.CambridgeCB3 OFSUK
| | - Antoinette J. Taylor
- Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosNM87545USA
| | - Rohit P. Prasankumar
- Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosNM87545USA
| | - Turab Lookman
- Theoretical DivisionLos Alamos National LaboratoryLos AlamosNM87545USA
| | - Jiangyu Li
- Department of Mechanical EngineeringUniversity of WashingtonSeattleWA98195USA
| | - Dmitry Yarotski
- Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosNM87545USA
| | - Quanxi Jia
- Department of Materials Design and InnovationUniversity at Buffalo—The State University of New YorkBuffaloNY14260USA
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5
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Lee SH, Tian G, Kim TC, Jung HK, Choi JW, Walker FJ, Ahn CH, Ross CA, Kim DH. Integration of sputter-deposited multiferroic CoFe 2O 4-BiFeO 3 nanocomposites on conductive La 0.7Sr 0.3MnO 3 electrodes. NANOTECHNOLOGY 2019; 30:105601. [PMID: 30537681 DOI: 10.1088/1361-6528/aaf7cd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
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. A reorientation of the CFO magnetic easy axis to an in-plane direction occurred as the LSMO became thicker due to changes in the strain state of the CFO pillars. The LSMO underlayer enabled the ferroelectric response of the BFO to be measured. Nanocomposites were grown onto LSMO/SrTiO3/Si which provides a path towards large scale integration of electrically contacted nanocomposites on Si.
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Affiliation(s)
- Seung Han Lee
- Department of Materials Science and Engineering, Myongji University, Yongin, Republic of Korea
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6
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Ullah R, Ke X, Malik IA, Gu Z, Wang C, Ahmad M, Yang Y, Zhang W, An X, Wang X, Zhang J. Controllable Ferroelastic Switching in Epitaxial Self-Assembled Aurivillius Nanobricks. ACS APPLIED MATERIALS & INTERFACES 2019; 11:7296-7302. [PMID: 30675776 DOI: 10.1021/acsami.8b22080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Layered perovskites with Aurivillius phase have drawn tremendous attention recently, owing to their high ferroelectric Curie temperatures, large spontaneous polarization, and fatigue-free and environment-friendly characteristics. Bi2WO6 is one of the simplest members in the Aurivillius family with superior ferroelastic and photo-electrochemical behaviors. The self-assembly fabrication of its nanoarchitectures and strategic modulation of their ferroelastic switching are crucial toward highly efficient nanoscale applications. In this work, Bi2WO6 nanobrick arrays were epitaxially grown along the orthorhombic direction in a self-assembled way. Such a nanoscale topology supports out-of-plane and in-plane vectors of ferroelectric polarizations, enabling a perpendicular voltage manipulation of these emerging ferroelectric/elastic domains. Combining the scanning probe technique and transmission electron microscopy, we confirmed the in-plane polarization vectors of 78.6 and 101.4° within the crystallographic axes of the nanobricks with respect to the (110) plane of the substrate. Thus, this work provides new opportunities for ferroelectric/elastic engineering in Bi2WO6 nanostructures for a wide range of applications, such as sensing, actuating, and catalysis.
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Affiliation(s)
- Rizwan Ullah
- Department of Physics , Beijing Normal University , 100875 Beijing , China
| | - Xiaoxing Ke
- Institute of Microstructures and Properties of Advanced Materials , Beijing University of Technology , 100124 Beijing , China
| | | | - Zhenao Gu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , 100085 Beijing , China
| | - Chuanshou Wang
- Department of Physics , Beijing Normal University , 100875 Beijing , China
| | - Munir Ahmad
- Department of Physics , Beijing Normal University , 100875 Beijing , China
| | - Yuben Yang
- Department of Physics , Beijing Normal University , 100875 Beijing , China
| | - Wenkai Zhang
- Department of Physics , Beijing Normal University , 100875 Beijing , China
| | - Xiaoqiang An
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , 100085 Beijing , China
| | - Xueyun Wang
- School of Aerospace Engineering , Beijing Institute of Technology , 100081 Beijing , China
| | - Jinxing Zhang
- Department of Physics , Beijing Normal University , 100875 Beijing , China
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7
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Chen A, Su Q, Han H, Enriquez E, Jia Q. Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1803241. [PMID: 30368932 DOI: 10.1002/adma.201803241] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 08/13/2018] [Indexed: 06/08/2023]
Abstract
Vertically aligned nanocomposite thin films with ordered two phases, grown epitaxially on substrates, have attracted tremendous interest in the past decade. These unique nanostructured composite thin films with large vertical interfacial area, controllable vertical lattice strain, and defects provide an intriguing playground, allowing for the manipulation of a variety of functional properties of the materials via the interplay among strain, defect, and interface. This field has evolved from basic growth and characterization to functionality tuning as well as potential applications in energy conversion and information technology. Here, the remarkable progress achieved in vertically aligned nanocomposite thin films from a perspective of tuning functionalities through control of strain, defect, and interface is summarized.
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Affiliation(s)
- Aiping Chen
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Qing Su
- Nebraska Center for Energy Sciences Research, University of Nebraska-Lincoln, Lincoln, NE, 68583, USA
| | - Hyungkyu Han
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Erik Enriquez
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Quanxi Jia
- Department of Materials Design and Innovation, University at Buffalo-The State University of New York, Buffalo, NY, 14260, USA
- Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul, 143-701, South Korea
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8
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Zhang D, Cheng J, Chai J, Deng J, Ren R, Su Y, Wang H, Ma C, Lee CS, Zhang W, Zheng GP, Cao M. Magnetic-field-induced dielectric behaviors and magneto-electrical coupling of multiferroic compounds containing cobalt ferrite/barium calcium titanate composite fibers. JOURNAL OF ALLOYS AND COMPOUNDS 2018; 740:1067-1076. [PMID: 29628623 PMCID: PMC5806601 DOI: 10.1016/j.jallcom.2018.01.081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/04/2018] [Accepted: 01/05/2018] [Indexed: 05/06/2023]
Abstract
Multiferroics have broad application prospects in various fields such as multi-layer ceramic capacitors and multifunctional devices owing to their high dielectric constants and coupled magnetic and ferroelectric properties at room temperature. In this study, cobalt ferrite (CFO)/barium calcium titanate (BCT) composite fibers are prepared from BCT and CFO sols by an electrospinning method, and are then oriented by magnetic fields and sintered at high temperatures. The effects of magnetic fields and CFO contents on the nanostructures and magnetoelectric properties of the composites are investigated. Strong coupling between magnetic and ferroelectric properties occurs in CFO/BCT composites with magnetic orientation. More interestingly, the dielectric constants of CFO/BCT composites with magnetic orientation are found to be enhanced (by ∼1.5-3.5 times) as compared with those of BCT and CFO/BCT without magnetic orientation. The boost of dielectric constants of magnetic-field orientated CFO/BCT is attributed to the magneto-electrical coupling between CFO and BCT, where the polar domains of BCT are pinned by the orientated CFO. Therefore, this work not only provides a novel and effective approach in enhancing the dielectric constants of ceramic ferroelectrics, which is of tremendous value for industrial applications, but also elucidates the interaction mechanisms between ferromagnetic phase and ferroelectric phase in multiferroic compounds.
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Affiliation(s)
- Deqing Zhang
- School of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China
| | - Junye Cheng
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
- Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 999077, Hong Kong
| | - Jixing Chai
- School of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China
| | - Jiji Deng
- School of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China
| | - Ran Ren
- Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 999077, Hong Kong
| | - Yang Su
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
| | - Hao Wang
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
| | - Chunqing Ma
- Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 999077, Hong Kong
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 999077, Hong Kong
| | - Wenjun Zhang
- Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 999077, Hong Kong
| | - Guang-Ping Zheng
- Department of Mechanical Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Maosheng Cao
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
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9
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Poddar S, de Sa P, Cai R, Delannay L, Nysten B, Piraux L, Jonas AM. Room-Temperature Magnetic Switching of the Electric Polarization in Ferroelectric Nanopillars. ACS NANO 2018; 12:576-584. [PMID: 29298391 DOI: 10.1021/acsnano.7b07389] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Magnetoelectric layers with a strong coupling between ferroelectricity and ferromagnetism offer attractive opportunities for the design of new device architectures such as dual-channel memory and multiresponsive sensors and actuators. However, materials in which a magnetic field can switch an electric polarization are extremely rare, work most often only at very low temperatures, and/or comprise complex materials difficult to integrate. Here, we show that magnetostriction and flexoelectricity can be harnessed to strongly couple electric polarization and magnetism in a regularly nanopatterned magnetic metal/ferroelectric polymer layer, to the point that full reversal of the electric polarization can occur at room temperature by the sole application of a magnetic field. Experiments supported by finite element simulations demonstrate that magnetostriction produces large strain gradients at the base of the ferroelectric nanopillars in the magnetoelectric hybrid layer, translating by flexoelectricity into equivalent electric fields larger than the coercive field of the ferroelectric polymer. Our study shows that flexoelectricity can be advantageously used to create a very strong magnetoelectric coupling in a nanopatterned hybrid layer.
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Affiliation(s)
- Shashi Poddar
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Pedro de Sa
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Ronggang Cai
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Laurent Delannay
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Bernard Nysten
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Luc Piraux
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Alain M Jonas
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
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10
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Gao M, Viswan R, Tang X, Leung CM, Li J, Viehland D. Magnetoelectricity of CoFe 2O 4 and tetragonal phase BiFeO 3 nanocomposites prepared by pulsed laser deposition. Sci Rep 2018; 8:323. [PMID: 29321643 PMCID: PMC5762771 DOI: 10.1038/s41598-017-18788-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 12/18/2017] [Indexed: 11/09/2022] Open
Abstract
The coupling between the tetragonal phase (T-phase) of BiFeO3 (BFO) and CoFe2O4 (CFO) in magnetoelectric heterostructures has been studied. Bilayers of CFO and BFO were deposited on (001) LaAlO3 single crystal substrates by pulsed laser deposition. After 30 min of annealing, the CFO top layer exhibited a T-phase-like structure, developing a platform-like morphology with BFO. Magnetic hysteresis loops exhibited a strong thickness effect of the CFO layer on the coercive field, in particular along the out-of-plane direction. Magnetic force microscopy images revealed that the T-phase CFO platform contained multiple magnetic domains, which could be tuned by applying a tip bias. A combination of shape, strain, and exchange coupling effects are used to explain the observations.
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Affiliation(s)
- Min Gao
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA.
| | - Ravindranath Viswan
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Xiao Tang
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Chung Ming Leung
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Jiefang Li
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - D Viehland
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
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11
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Pham CD, Chang J, Zurbuchen MA, Chang JP. Magnetic Properties of CoFe 2O 4 Thin Films Synthesized by Radical-Enhanced Atomic Layer Deposition. ACS APPLIED MATERIALS & INTERFACES 2017; 9:36980-36988. [PMID: 28925262 DOI: 10.1021/acsami.7b08097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A radical-enhanced atomic layer deposition (RE-ALD) process was developed for growing ferrimagnetic CoFe2O4 thin films. By utilizing bis(2,2,6,6-tetramethyl-3,5-heptanedionato) cobalt(II), tris(2,2,6,6-tetramethyl-3,5-heptanedionato) iron(III), and atomic oxygen as the metal and oxidation sources, respectively, amorphous and stoichiometric CoFe2O4 films were deposited onto SrTiO3 (001) substrates at 200 °C. The RE-ALD growth rate obtained for CoFe2O4 is ∼2.4 Å/supercycle, significantly higher than the values reported for thermally activated ALD processes. Microstructural characterization by X-ray diffraction and transmission electron microscopy indicate that the CoFe2O4 films annealed between 450 and 750 °C were textured polycrystalline with an epitaxial interfacial layer, which allows strain-mediated tuning of the magnetic properties given its highly magnetostrictive nature. The magnetic behavior was studied as a function of film thickness and annealing temperature: saturation magnetization (Ms) ranged from 260 to 550 emu/cm3 and magnetic coercivity (Hc) ranged from 0.2 to 2.2 kOe. Enhanced magnetic anisotropy was achieved in the thinner samples, whereas the overall magnetic strength improved after annealing at higher temperatures. The RE-ALD CoFe2O4 thin films exhibit magnetic properties that are comparable to both bulk crystal and films grown by other deposition methods, with thickness as low as ∼7 nm, demonstrating the potential of RE-ALD for the synthesis of high-quality magnetic oxides with large-scale processing compatibility.
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Affiliation(s)
- Calvin D Pham
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
| | - Jeffrey Chang
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
| | - Mark A Zurbuchen
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
| | - Jane P Chang
- Department of Chemical and Biomolecular Engineering and ‡Department of Electrical Engineering, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States
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12
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Fan M, Zhang B, Wang H, Jian J, Sun X, Huang J, Li L, Zhang X, Wang H. Self-Organized Epitaxial Vertically Aligned Nanocomposites with Long-Range Ordering Enabled by Substrate Nanotemplating. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1606861. [PMID: 28401590 DOI: 10.1002/adma.201606861] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 02/14/2017] [Indexed: 06/07/2023]
Abstract
Vertically aligned nanocomposites (VAN) thin films present as an intriguing material family for achieving novel functionalities. However, most of the VAN structures tend to grow in a random fashion, hindering the future integration in nanoscale devices. Previous efforts for achieving ordered nanopillar structures have been focused on specific systems, and rely on sophisticated lithography and seeding techniques, making large area ordering quite difficult. In this work, a new technique is presented to produce self-assembled nanocomposites with long-range ordering through selective nucleation of nanocomposites on termination patterned substrates. Specifically, SrTiO3 (001) substrates have been annealed to achieve alternating chemical terminations and thus enable selective epitaxy during the VAN growth. La0.7 Sr0.3 MnO3 :CeO2 (LSMO):CeO2 nanocomposites, as a prototype, are demonstrated to form well-ordered rows in matrix structure, with CeO2 (011) domains selectively grown on SrO terminated area, showing enhanced functionality. This approach provides a large degree of long-range ordering for nanocomposite growth that could lead to unique functionalities and takes the nanocomposites one step closer toward future nanoscale device integration.
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Affiliation(s)
- Meng Fan
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Bruce Zhang
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Han Wang
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Jie Jian
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Xing Sun
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Jijie Huang
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Leigang Li
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Xinghang Zhang
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Haiyan Wang
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843, USA
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA
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13
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Tang D, Zeng Z, Zhou Q, Su S, Hu D, Li P, Lin X, Gao X, Lu X, Wang X, Jin M, Zhou G, Zhang Z, Liu J. Ordered multiferroic CoFe2O4–Pb(Zr0.52Ti0.48)O3coaxial nanotube arrays with enhanced magnetoelectric coupling. RSC Adv 2017. [DOI: 10.1039/c7ra04183g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
In this paper, vertically free-standing multiferroic CoFe2O4–Pb(Zr0.52Ti0.48)O3(CFO–PZT) coaxial nanotube arrays with both good ordering and high density were prepared by a template-assisted sol–gel method.
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14
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Bian L, Li HL, Dong HL, Dong FQ, Song MX, Wang LS, Hou WP, Gao L, Zhang XY, Zhou TL, Sun GA, Li XX, Xie L. Mechanism of Fluorescence Enhancement of Biosynthesized XFe 2O 4-BiFeO 3 (X = Cr, Mn, Co, or Ni) Membranes. NANOSCALE RESEARCH LETTERS 2016; 11:543. [PMID: 27928781 PMCID: PMC5143335 DOI: 10.1186/s11671-016-1747-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Accepted: 11/21/2016] [Indexed: 06/06/2023]
Abstract
Ferrites-bismuth ferrite is an intriguing option for medical diagnostic imaging device due to its magnetoelectric and enhanced near-infrared fluorescent properties. However, the embedded XFO nanoparticles are randomly located on the BFO membranes, making implementation in devices difficult. To overcome this, we present a facile bio-approach to produce XFe2O4-BiFeO3 (XFO-BFO) (X = Cr, Mn, Co, or Ni) membranes using Shewanella oneidensis MR-1. The perovskite BFO enhances the fluorescence intensity (at 660 and 832 nm) and surface potential difference (-469 ~ 385 meV and -80 ~ 525 meV) of the embedded spinel XFO. This mechanism is attributed to the interfacial coupling of the X-Fe (e- or h+) and O-O (h+) interfaces. Such a system could open up new ideas in the design of environmentally friendly fluorescent membranes.
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Affiliation(s)
- Liang Bian
- Institute of Gem and Material Technology, Hebei GEO University, Shijiazhuang, 050000, Hebei, China.
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang, 621010, Sichuan, China.
- Key Laboratory of Functional Materials and Devices under Special Environments, Chinese Academy of Sciences, Urumqi, 830011, Xinjiang, China.
| | - Hai-Long Li
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang, 621010, Sichuan, China
- Key Laboratory of Functional Materials and Devices under Special Environments, Chinese Academy of Sciences, Urumqi, 830011, Xinjiang, China
| | - Hai-Liang Dong
- Department of Geology and Environmental Earth Science, Miami University, Oxford, 45056, USA
| | - Fa-Qin Dong
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang, 621010, Sichuan, China
| | - Mian-Xin Song
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang, 621010, Sichuan, China
| | - Li-Sheng Wang
- Institute of Gem and Material Technology, Hebei GEO University, Shijiazhuang, 050000, Hebei, China
| | - Wen-Ping Hou
- Key Laboratory of Functional Materials and Devices under Special Environments, Chinese Academy of Sciences, Urumqi, 830011, Xinjiang, China
| | - Lei Gao
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang, 621010, Sichuan, China
| | - Xiao-Yan Zhang
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang, 621010, Sichuan, China
- Key Laboratory of Functional Materials and Devices under Special Environments, Chinese Academy of Sciences, Urumqi, 830011, Xinjiang, China
| | - Tian-Liang Zhou
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang, 621010, Sichuan, China
| | - Guang-Ai Sun
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, 621900, Sichuan, China
| | - Xin-Xi Li
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, 621900, Sichuan, China
| | - Lei Xie
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, 621900, Sichuan, China
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15
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Ojha S, Nunes WC, Aimon NM, Ross CA. Magnetostatic Interactions in Self-Assembled CoxNi1-xFe2O4/BiFeO3 Multiferroic Nanocomposites. ACS NANO 2016; 10:7657-7664. [PMID: 27434047 DOI: 10.1021/acsnano.6b02985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Self-assembled vertically aligned oxide nanocomposites consisting of magnetic pillars embedded in a ferroelectric matrix have been proposed for logic devices made from arrays of magnetostatically interacting pillars. To control the ratio between the nearest neighbor interaction field and the switching field of the pillars, the pillar composition CoxNi1-xFe2O4 was varied over the range 0 ≤ x ≤ 1, which alters the magnetoelastic and magnetocrystalline anisotropy and the saturation magnetization. Nanocomposites were templated into square arrays of pillars in which the formation of a "checkerboard" ground state after ac-demagnetization indicated dominant magnetostatic interactions. The effect of switching field distribution in disrupting the antiparallel nearest neighbor configuration was analyzed using an Ising model and compared with experimental results.
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Affiliation(s)
- Shuchi Ojha
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Wallace C Nunes
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Nicolas M Aimon
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Caroline A Ross
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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16
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Status and Perspectives of Multiferroic Magnetoelectric Composite Materials and Applications. ACTUATORS 2016. [DOI: 10.3390/act5010009] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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17
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Kim DH, Sun X, Kim TC, Eun YJ, Lee T, Jeong SG, Ross CA. Magnetic Phase Formation in Self-Assembled Epitaxial BiFeO3-MgO and BiFeO3-MgAl2O4 Nanocomposite Films Grown by Combinatorial Pulsed Laser Deposition. ACS APPLIED MATERIALS & INTERFACES 2016; 8:2673-2679. [PMID: 26750565 DOI: 10.1021/acsami.5b10676] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Self-assembled epitaxial BiFeO3-MgO and BiFeO3-MgAl2O4 nanocomposite thin films were grown on SrTiO3 substrates by pulsed laser deposition. A two-phase columnar structure was observed for BiFeO3-MgO codeposition within a small window of growth parameters, in which the pillars consisted of a magnetic spinel phase (Mg,Fe)3O4 within a BiFeO3 matrix, similar to the growth of BiFeO3-MgFe2O4 nanocomposites reported elsewhere. Further, growth of a nanocomposite with BiFeO3-(CoFe2O4/MgO/MgFe2O4), in which the minority phase was grown from three different targets, gave spinel pillars with a uniform (Mg,Fe,Co)3O4 composition due to interdiffusion during growth, with a bifurcated shape from the merger of neighboring pillars. BiFeO3-MgAl2O4 did not form a well-defined vertical nanocomposite in spite of having lower lattice mismatch, but instead formed a two-phase film with in which the spinel phase contained Fe. These results illustrate the redistribution of Fe between the oxide phases during oxide codeposition to form a ferrimagnetic phase from antiferromagnetic or nonmagnetic targets.
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Affiliation(s)
- Dong Hun Kim
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
- Department of Materials Science and Engineering, Myongji University , Yongin 120-728, Republic of Korea
| | - XueYin Sun
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
- School of Materials Science and Engineering, Harbin Institute of Technology , Harbin 150001, People's Republic of China
| | - Tae Cheol Kim
- Department of Materials Science and Engineering, Myongji University , Yongin 120-728, Republic of Korea
| | - Yun Jae Eun
- Department of Materials Science and Engineering, Myongji University , Yongin 120-728, Republic of Korea
| | - Taeho Lee
- Department of Materials Science and Engineering, Myongji University , Yongin 120-728, Republic of Korea
| | - Sung Gyun Jeong
- Department of Materials Science and Engineering, Myongji University , Yongin 120-728, Republic of Korea
| | - Caroline A Ross
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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18
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Tian G, Zhang F, Yao J, Fan H, Li P, Li Z, Song X, Zhang X, Qin M, Zeng M, Zhang Z, Yao J, Gao X, Liu J. Magnetoelectric Coupling in Well-Ordered Epitaxial BiFeO3/CoFe2O4/SrRuO3 Heterostructured Nanodot Array. ACS NANO 2016; 10:1025-1032. [PMID: 26651132 DOI: 10.1021/acsnano.5b06339] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Multiferroic magnetoelectric (ME) composites exhibit sizable ME coupling at room temperature, promising applications in a wide range of novel devices. For high density integrated devices, it is indispensable to achieve a well-ordered nanostructured array with reasonable ME coupling. For this purpose, we explored the well-ordered array of isolated epitaxial BiFeO3/CoFe2O4/SrRuO3 heterostructured nanodots fabricated by nanoporous anodic alumina (AAO) template method. The arrayed heterostructured nanodots demonstrate well-established epitaxial structures and coexistence of piezoelectric and ferromagnetic properties, as revealed by transmission electron microscopy (TEM) and peizoeresponse/magnetic force microscopy (PFM/MFM). It was found that the heterostructured nanodots yield apparent ME coupling, likely due to the effective transfer of interface couplings along with the substantial release of substrate clamping. A noticeable change in piezoelectric response of the nanodots can be triggered by magnetic field, indicating a substantial enhancement of ME coupling. Moreover, an electric field induced magnetization switching in these nanodots can be observed, showing a large reverse ME effect. These results offer good opportunities of the nanodots for applications in high-density ME devices, e.g., high density recording (>100 Gbit/in.(2)) or logic devices.
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Affiliation(s)
- Guo Tian
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Fengyuan Zhang
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Junxiang Yao
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Hua Fan
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Peilian Li
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Zhongwen Li
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Xiao Song
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Xiaoyan Zhang
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Minghui Qin
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Min Zeng
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Zhang Zhang
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Jianjun Yao
- Asylum Research , Santa Barbara, California 93117, United States
| | - Xingsen Gao
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
| | - Junming Liu
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University , Guangzhou 510006, China
- Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China
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19
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Strelcov E, Belianinov A, Hsieh YH, Chu YH, Kalinin SV. Constraining Data Mining with Physical Models: Voltage- and Oxygen Pressure-Dependent Transport in Multiferroic Nanostructures. NANO LETTERS 2015; 15:6650-6657. [PMID: 26312554 DOI: 10.1021/acs.nanolett.5b02472] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Development of new generation electronic devices necessitates understanding and controlling the electronic transport in ferroic, magnetic, and optical materials, which is hampered by two factors. First, the complications of working at the nanoscale, where interfaces, grain boundaries, defects, and so forth, dictate the macroscopic characteristics. Second, the convolution of the response signals stemming from the fact that several physical processes may be activated simultaneously. Here, we present a method of solving these challenges via a combination of atomic force microscopy and data mining analysis techniques. Rational selection of the latter allows application of physical constraints and enables direct interpretation of the statistically significant behaviors in the framework of the chosen physical model, thus distilling physical meaning out of raw data. We demonstrate our approach with an example of deconvolution of complex transport behavior in a bismuth ferrite-cobalt ferrite nanocomposite in ambient and ultrahigh vacuum environments. Measured signal is apportioned into four electronic transport patterns, showing different dependence on partial oxygen and water vapor pressure. These patterns are described in terms of Ohmic conductance and Schottky emission models in the light of surface electrochemistry. Furthermore, deep data analysis allows extraction of local dopant concentrations and barrier heights empowering our understanding of the underlying dynamic mechanisms of resistive switching.
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Affiliation(s)
- Evgheni Strelcov
- Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Alexei Belianinov
- Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Ying-Hui Hsieh
- Department of Materials Science and Engineering, National Chiao Tung University , Hsinchu 30010, Taiwan
| | - Ying-Hao Chu
- Department of Materials Science and Engineering, National Chiao Tung University , Hsinchu 30010, Taiwan
- Institute of Physics, Academia Sinica , Taipei 105, Taiwan
| | - Sergei V Kalinin
- Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
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20
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Lu XL, Zhang JW, Zhang CF, Zhang JC, Hao Y. Highly ordered core–shell CoFe2O4–BiFeO3 nanocomposite arrays from dimension confined phase separation and their interfacial magnetoelectric coupling properties. RSC Adv 2015. [DOI: 10.1039/c5ra05106a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
With dimension confinement, highly ordered core–shell CoFe2O4–BiFeO3 nanocomposite arrays were obtained from the self-assembly phase separation.
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Affiliation(s)
- X. L. Lu
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology
- School of Microelectronics
- Xidian University
- 710071 Xi'an
- China
| | - J. W. Zhang
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology
- School of Microelectronics
- Xidian University
- 710071 Xi'an
- China
| | - C. F. Zhang
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology
- School of Microelectronics
- Xidian University
- 710071 Xi'an
- China
| | - J. C. Zhang
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology
- School of Microelectronics
- Xidian University
- 710071 Xi'an
- China
| | - Y. Hao
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology
- School of Microelectronics
- Xidian University
- 710071 Xi'an
- China
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21
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Choi HK, Aimon NM, Kim DH, Sun XY, Gwyther J, Manners I, Ross CA. Hierarchical templating of a BiFeO3-CoFe2O4 multiferroic nanocomposite by a triblock terpolymer film. ACS NANO 2014; 8:9248-9254. [PMID: 25184546 DOI: 10.1021/nn503100s] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A process route to fabricate templated BiFeO3/CoFe2O4 (BFO/CFO) vertical nanocomposites is presented in which the self-assembly of the BFO/CFO is guided using a self-assembled triblock terpolymer. A linear triblock terpolymer was selected instead of a diblock copolymer in order to produce a square-symmetry template, which had a period of 44 nm. The triblock terpolymer pattern was transferred to a (001) Nb:SrTiO3 substrate to produce pits that formed preferential sites for the nucleation of CFO crystals, in contrast to the BFO, which wetted the flat regions of the substrate. The crystallographic orientation and magnetic properties of the templated BFO/CFO were characterized.
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Affiliation(s)
- Hong Kyoon Choi
- Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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