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The magnetic and dielectric properties of multiferroic Sr-substituted Zn_2-Y hexagonal ferrites

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Chinese Physics B 2008年第12期17卷 4652-4655页

作者：徐芳白洋艾芬乔利杰 Corrosion and Protection Center Key Laboratory of Environmental Fracture (Ministry of Education)University of Science and Technology Beijing

The magnetic and dielectric properties of Sr-substituted Zn2-Y hexagonal ferrites （Ba2-x SrxZn2Fe12O22, 1.0 〈 x ≤ 1.5） are studied in this paper. Sr substitution will lead to the variation of cation occupation, which influences both the magnetic and electric properties. As Sr content x rises from 1.0 to 1.5, magnetic hysteresis loop gets wider gradually and the permeability drops rapidly due to the transformation from ferrimagnetic to antiferromagnetic phase. Moreover, permittivity rises with increasing Sr content. Under a certain external magnetic field, the phase transition of helical spin structure of Ba0.5Srl.5Zn2Fe12O22 at about 295 K seems to open a possibility for the room-temperature ferroelectricity induced by magnetic field. But its low resistivity prevents the observation of ferroelectric and magnetoelectric properties at room-temperature.

关键词： hexagonal ferrite Sr substitution multiferroic polycrystal

Recent development of E-field control of interfacial magnetism in multiferroic heterostructures

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Nano Research 2023年第4期16卷 5983-6000页

作者： Yuxin Cheng Shishun Zhao Ziyao Zhou Ming Liu The Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringState Key Laboratory for Mechanical Behavior of Materialsthe International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologyXi'an Jiaotong UniversityXi'an 710049China

The full E-field control of multiferroic interfacial magnetism is a long-standing challenge for micro-electromechanical systems(MEMS)and has the potential to transform electronics operation *** scaling down conventional complementary metal-oxide semiconductor(CMOS)devices,increased heating dissipation becomes a top *** the highly correlated ferroic orders,notably the strongly coupled interfacial magnetoelectric(ME)interactions,may lead to devices beyond *** devices use the electric field to regulate magnetization,which opens up the prospect of downsizing,improved performance,and lower power *** broadly survey this tremendous scope within the last five years,this review summarizes advances in voltage control of interfacial magnetism(VCIM)with various material system selection;controlling effects with different gating methods are also *** classic mechanisms are demonstrated:strain,exchange bias,orbital reconstruction,and the electrostatic and *** encouraging photovoltaic approach is also *** method’s capabilities and application scenarios are *** of the comprehensive gating results of different magnetic coupling effects such as perpendicular magnetic anisotropy(PMA)and Ruderman-Kittel-Kasuya-Yosida(RKKY)are additionally *** last,controlling of skyrmions and two-dimensional(2D)material magnetization is summarized,indicating that E-field gating offers a universal approach with few limitations for material *** results point to potential for E-field control interfacial magnetism and predict significant future advancements for spintronics.

关键词： multiferroic magnetoelectric coupling strain charge photovoltaic

Large-scale multiferroic complex oxide epitaxy with magnetically switched polarization enabled by solution processing

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National Science Review 2020年第1期7卷 84-91页

作者： Cong Liu Feng An Paria S.M.Gharavi Qinwen Lu Junkun Zha Chao Chen Liming Wang Xiaozhi Zhan Zedong Xu Yuan Zhang Ke Qu Junxiang Yao Yun Ou Zhiming Zhao Xiangli Zhong Dongwen Zhang Nagarajan Valanoor Lang Chen Tao Zhu Deyang Chen Xiaofang Zhai Peng Gao Tingting Jia Shuhong Xie Gaokuo Zhong Jiangyu Li Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences School of Materials Science and Engineering Xiangtan University School of Materials Science and Engineering University of New South Wales Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemical Physics University of Science and Technology of China Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Dongguan Neutron Science Center Department of Physics Southern University of Science and Technology International Center for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Department of Physics College of Science National University of Defense Technology Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Songshan Lake Materials Laboratory Dongguan Neutron Science Center

Complex oxides with tunable structures have many fascinating properties, though high-quality complex oxide epitaxy with precisely controlled composition is still out of reach. Here we have successfully developed solution-based single-crystalline epitaxy for multiferroic（1-x）BiTi;/;Fe;Mg;/;O;–（x）CaTiO;（BTFM–CTO） solid solution in large area, confirming its ferroelectricity at the atomic scale with strong spontaneous polarization. Careful compositional tuning leads to a bulk magnetization of 0.07 ± 0.035 μB/Fe at room temperature, enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7–3.0 × 10;s/m. This work demonstrates the great potential of solution processing in large-scale complex oxide epitaxy and establishes novel room-temperature magnetoelectric coupling in epitaxial BTFM–CTO film, making it possible to explore a much wider space of composition,phase, and structure that can be easily scaled up for industrial applications.

关键词： complex oxide solution method epitaxy multiferroic

Polarization pinning at antiphase boundaries in multiferroic YbFeO_(3)

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Chinese Physics B 2024年第11期33卷 39-45页

作者： Guodong Ren Pravan Omprakash Xin Li Yu Yun Arashdeep S.Thind Xiaoshan Xu Rohan Mishra Institute of Materials Science and Engineering Washington University in St.LouisSt.LouisMO 63130USA Department of Physics and Astronomy University of NebraskaLincolnNE 68588USA Department of Mechanical Engineering & Mechanics Drexel UniversityPhiladelphiaPA 19104-2875USA Nebraska Center for Materials and Nanoscience University of NebraskaLincolnNE 68588USA Department of Mechanical Engineering and Material Science Washington University in St.LouisSt.LouisMO 63130USA

The switching characteristics of ferroelectrics and multiferroics are influenced by the interaction of topological defects with domain *** report on the pinning of polarization due to antiphase boundaries in thin films of the multiferroic hexagonal YbFeO_(3).We have directly resolved the atomic structure of a sharp antiphase boundary(APB)in YbFeO_(3) thin films using a combination of aberration-corrected scanning transmission electron microscopy(STEM)and total energy calculations based on density-functional theory(DFT).We find the presence of a layer of FeO_(6) octahedra at the APB that bridges the adjacent *** imaging shows a reversal in the direction of polarization on moving across the APB,which DFT calculations confirm is structural in nature as the polarization reversal reduces the distortion of the FeO_(6) octahedral layer at the *** APBs in hexagonal perovskites are expected to serve as domain-wall pinning sites and hinder ferroelectric switching of the domains.

关键词： hexagonal ferrites ferroelectric multiferroic topological defect STEM

La-doped BiFeO_3:Synthesis and multiferroic property study

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Chinese Physics B 2014年第4期23卷 572-577页

作者：蔺鹏婷李祥张丽阴津华程兴旺王志宏吴玉娟吴光恒 School for Materials Science and Engineering Beijing Institute of Technology Physics Department University of Science & Technology of Beijing State Key Laboratory of Magnetism Institute of Physics Chinese Academy of Sciences Department of Materials and Mineral Resources Engineering National Taipei University of Technology

A new sol-foam-gel method was developed to fabricate La-doped BiFeO3 muttiferroic materials. It was demonstrated that a gradual increase in the content of La-doped into BiFeO3 results in its structure changing from rhombohedral to orthorhombic. A study of other property changes indicates that La-doping in BiFeO3 enhances its ferromagnetism and ferroelectricity. A temperature-dependent magnetization study suggests that the magnetic property of La-doped BiFeO3 samples varied from antiferromagnetic to ferromagnetic as the content of La-doped into BiFeO3 increased from 0 to 20%. Unique temperature-dependent zero field cooling （ZFC） and field cooling （FC） magnetization behaviors were observed in 15% La-doped BiFeO3 -- its ZFC temperature-dependent magnetization being ferromagnetic and its FC temperature- dependent magnetization being antiferromagnetic. A possible mechanism of such an interesting M-T behavior is discussed.

关键词： multiferroic BiFeO3 ferromagnetism

Synthesis, microstructures, and magnetoelectric couplings of electrospun multiferroic nanofibers

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Frontiers of physics 2012年第4期7卷 399-407页

作者：谢淑红刘运牙李江宇 Faculty of Materials Optoelectronics and Physicsand Key Laboratory of Low Dimensional Materials&Application Technology of Ministry of EducationXiangtan UniversityXiangtan 411105China Department of Mechanical Engineering University of WashingtonSeattleWA 98195USA

multiferroic materials with two or more types of ferroic orders have attracted a great deal of atten- tion in the last decade for their magnetoelectric coupling, and new ideas and concepts have been ex- plored recently to develop multiferroic materials at nano-scale. Motivated by theoretical analysis, we synthesized single-phase BiFeO3 （BFO） nanofibers, Pb（Zr0.52Ti0.48）O3-CoFe2O4 （PZT-CFO） and Pb（***）Oa-NiFe204 （PZT-NFO） composite nanofibers, and CoFe2O4-Pb（Zr0.52Ti0.48）O3 （CFO-PZT） core-shell nanofibers using sol-gel based electrospinning. These nanofibers typically have diameters in the range of a few hundred nanometers and grain size in the range of 10s nanome- ters, and exhibits both ferroelectric and ferromagnetic properties. Piezoresponse force microscopy （PFM） based techniques have also been developed to examine the magnetoelectrie coupling of the nanofibers, which is estimated to be two orders of magnitude higher than that of thin films, con- sistent with our theoretical analysis. These nanofibers are promising for a variety of multiferroic applications.

关键词： multiferroic nanofiber magnetoelectric piezoresponse force microscopy

Improved multiferroic properties of La-doped 0.6BiFeO_3-0.4SrTiO_3 solid solution ceramics

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Chinese Physics B 2012年第10期21卷 462-465页

作者：马争争李建青田召明邱洋袁松柳 School of Physics Huazhong University of Science and Technology School of Sciences Wuhan University of Science and Technology

The 0.6（Bi1-xLax）FeO 3-0.4SrTiO 3（x = 0,0.1） multiferroic ceramics are prepared by a modified Pechini method to study the effect of substitution of SrTiO3 and La in *** X-ray diffraction patterns confirm the single phase characteristics of all the compositions each with a rhombohedral *** magnetic properties of the ceramics are significantly improved by a solid solution with SrTiO3 and substitution of *** values of the dielectric constant ε r and loss tangent tan δ of all the samples decrease with increasing frequency and become constant at room *** La-doped 0.6BiFeO3-0.4SrTiO3 ceramics exhibit improved dielectric and ferroelectric properties,with higher dielectric constant enhanced remnant polarization（Pr） and lower leakage current at room *** with a anti-ferromagnetic BiFeO3 compound,the 0.6（Bi0.9La0.1）FeO3-0.4SrTiO3 sample shows the optimal ferromagnetism with remnant magnetization M r ～ 0.135 emμ/g and ferroelectricity with Pr ～ 5.94 μC/cm 2 at room temperature.

关键词： multiferroic ferroelectric dielectric constant ferromagnetic

Effects of Ba and Ti co-doping on BiFeO3 multiferroic ceramics optimized through two-step doping

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Journal of Advanced Ceramics 2016年第3期5卷 204-209页

作者： Sheng ZHU Yanhong GU Yao XIONG Xi ZHOU Yong LIU Yu WANG Wanping CHEN Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and Technology Wuhan University Wuhan Hubei 430072 China School of Physics and Electronic Information Luoyang Normal College Luoyang Henan 471022 China School of Materials Science and Engineering Nanchang University Nanchang Jiangxi 330031 China

Ceramics of Bi0.9Ba0.1Fe0.925TixO3 (x = 0.0625, 0.08125, 0.0875, and 0.11) were prepared according to two doping strategies: one is called single-step doping in which Ba and Ti were doped together in calcination, while the other one is called two-step doping in which Ba and Ti were doped in calcination and sintering, respectively. Compared with samples prepared with single-step doping, those prepared with two-step doping have obviously different XRD patterns and small grains, and are dramatically improved in dielectric loss, resistivity, and remnant magnetization. A low dielectric loss of 0.05 at 10(3) Hz, a high resistivity of 4x10(12) ***, and a large remnant magnetization of 1.5 emu/g, have been obtained simultaneously for Bi0.9Ba0.1Fe0.925Ti0.11O3 prepared with two-step doping. The contrast between these two doping strategies clearly reveals the importance of establishing a proper doping strategy when two or more elements are co-doped to BiFeO3.

关键词： BiFeO3 doping multiferroic nonstoichiometric

Magnetoelectric effects in multiferroic Y-type hexaferrites Ba(0.3)Sr(1.7)CoxMg(2-x)Fe(12)O(22)

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Chinese Physics B 2020年第3期29卷 402-405页

作者： Yanfen Chang Kun Zhai Young Sun Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science University of Chinese Academy of SciencesBeijing 100190China

Y-type hexaferrites with tunable conical magnetic structures are promising single-phase multiferroics that exhibit large magnetoelectric effects. We have investigated the influence of Co substitution on the magnetoelectric properties in the Y-type hexaferrites Ba(0.3)Sr(1.7)CoxMg(2-x)Fe(12)O(22)(x = 0.0, 0.4, 1.0, 1.6). The spin-induced electric polarization can be reversed by applying a low magnetic field for all the samples. The magnetoelectric phase diagrams of BaBa(0.3)Sr(1.7)CoxMg(2-x)Fe(12)O(22) are obtained based on the measurements of magnetic field dependence of dielectric constant at selected temperatures. It is found that the substitution of Co ions can preserve the ferroelectric phase up to a higher temperature, and thus is beneficial for achieving single-phase multiferroics at room temperature.

关键词： multiferroic magnetoelectric effect hexaferrite