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Studies on multiferroic materials in high magnetic fields

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Frontiers of physics 2012年第4期7卷 386-398页

作者： Masashi Tokunaga The International MegaGauss Science Laboratory The Institute for Solid State Physics (IMGSL-ISSP) The University of Tokyo Kashiwa 277-8581 Japan

In this article, studies on the magnetoelectric effects of multiferroic materials in high magnetic fields, particularly pulsed magnetic fields, are discussed and results for some representative ma- terials are presented. In the discussions on representative materials, the relationship between the crystallographic symmetry and the linear magnetoelectric effect in Cr203 is introduced. Then dras- tic changes in polarization caused by magnetic transitions are discussed through a case study of manganites with a perovskite4ype structure. In addition, high field studies on the magnetoelectric effects in BiFeO3, which is an exceptional multiferroic material, are presented and discussed in the framework of the Landau-Ginzburg theory.

关键词： high magnetic field multiferroic materials magnetoelectric effect

High-entropy enhanced room-temperature ferroelectricity in rare-earth orthoferrites

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Journal of Advanced Ceramics 2023年第4期12卷 724-733页

作者： Bo Ni Ater Bao Yaohang Gu Xiaoyan Zhang Xiwei Qi School of materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and materials Northeastern University at QinhuangdaoQinhuangdao 066004China College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210China

Single-phase multiferroic materials of rare-earth orthoferrites with magnetism and ferroelectricity are of great technological importance in storage devices.However,the polarization(P)of these materials is generally weak(0.01μC-cm^(-2)),and the ferroelectricity is reported to exist below room temperature(25℃).Here,(Bi_(0.2)La_(0.2)Y_(0.2)Dy_(0.2)Tb_(0.2))FeO_(3)(BLYDTFO)high-entropy oxides that exhibit a saturation P of 5.3μC.cm^(-2)at the electric field(E)of 45 kV·cm^(-1)at room temperature was designed and fabricated by the conventional solid-phase method.The results show that configurational entropy introduces atomic disorder and a larger tilt of BO6 octahedron,which facilitates noncentrosymmetric distortion and ferroelectricity at room temperature compared with other single components(LaFeO_(3),YFeO_(3),DyFeO_(3),and TbFeO_(3)).This high-entropy approach expands the compositional window of the rare-earth orthoferrites to enhance the ferroelectricity in multiferroic applications.

关键词： high-entropy rare-earth orthoferrites ferroelectricity multiferroic materials

Enhanced ferromagnetism and magnetoelectric response in quenched BiFeO3-based ceramics

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Chinese Physics B 2020年第8期29卷 465-470页

作者：潘祺初宝进 Key Laboratory of materials for Energy Conversion Chinese Academy of Sciences(CAS)Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

The piezoelectric,ferromagnetism,and magnetoelectric response of BiFeO3-BaTiO3 ceramics with the compositions around the morphotropic phase boundary(MPB)of the solid solution are systematically investigated after the ceramics have been quenched from a high temperature.We find that the ferromagnetism of the quenched ceramics is greatly enhanced.An enhanced piezoelectric response d33 larger than 200 pC/N,which could be sustained up to 350℃,is measured.As a result of enhanced ferromagnetism and piezoelectric response,a large magnetoelectric response^1.3 V/cm·Oe(1 Oe=79.5775 A·m^-1)is obtained near the mechanical resonance frequency of the quenched ceramic samples.Our research also shows that in addition to the ferromagnetism and piezoelectric response,the mechanical quality factor is another important parameter to achieve high magnetoelectric response because the physical effects are coupled through mechanical interaction in BiFeO3-based materials.Our work suggests that quenching is an effective approach to enhancing the magnetoelectric response of BiFeO3-based materials and the materials belong to single-phase multiferroic materials with high magnetoelectric response.

关键词： multiferroic materials magnetoelectric ferromagnetic piezoelectric

Study on superstructure in ion co-doped BiFeO_3 by using transmission electron microscopy

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Chinese Physics B 2015年第4期24卷 290-295页

作者：蒲十周郭超李美亚陈珍莲邹化民 Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology Wuhan University Center for Electron Microscopy Wuhan University Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences

La3＋ and V5＋ co-doped BiFeO3 ceramics are synthesized by rapid liquid sintering technique. The modulated structure in Bi0.85La0.15Fe0.97V0.03O3 is investigated by using transmission electron microscopy （TEM）. Two kinds of superstructures are observed in the samples. One is the component modulated superstructure and twin-domain, which is generated by La3＋ ordered substitution for Bi3＋ and frequently appears. The chemical composition of the superstructure is explored by x-ray energy dispersive spectroscopy （EDS）. The model of the ordered structure is proposed. Simulation based on the model is conducted. The second is the fluorite-type δ-Bi2O3 related superstructure. The relation between the ferroelectric property and the microstructure of the sample is also discussed.

关键词： multiferroic materials superstructure co-doped rapid liquid sintering technique

Nonreciprocal directional dichroism in multiferroics

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Science China(Physics,Mechanics & Astronomy) 2020年第10期63卷 47-61页

作者： Yang Shen Bing Yu WenYi Tong QingBiao Zhao ChunGang Duan Key Laboratory of Polar materials and Devices Ministry of EducationDepartment of Electronic ScienceEast China Normal UniversityShanghai 200062China Theoretical materials Physics Universitéde LiègeLiège B-4000Belgium Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Nonreciprocal directional dichroism in multiferroics,namely magnetoelectric coupling in the dynamic regime,is endowed with rich physics and promising applications,which are entangled with fundamental physical components,such as spin,orbital,lattice,charge,and topology.Such a linear nonreciprocal response behavior in the GHz-THz frequency range,represented by optical magnetoelectric effect and magnetochiral dichroism,occurs ubiquitously in material systems with the spontaneous breaking of space-time symmetry,and is subject to Onsager’s reciprocal theorem in the thermodynamic limit.Microscopically,these nonreciprocal responses are usually encoded by toroidization(chirality)and electromagnon(quasiparticle),thus establishing a comprehensive understanding of magnetoelectric coupling and irreversible dynamics.Herein,the basic mechanisms and emergent nonreciprocal directional dichroism in single-phase multiferroics are summarized.We expect that the present review will stimulate diverse possibilities toward nonreciprocal directional dichroism within and beyond multiferroics.

关键词： nonreciprocal directional dichroism multiferroic materials optical magnetoelectric effect magnetochiral dichroism electromagnon

Emergent ferroelectricity in disordered tri-color multilayer structure comprised of ferromagnetic manganites

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Chinese Physics B 2016年第10期25卷 423-427页

作者：牛利伟陈长乐董祥雷邢辉罗炳成金克新 The Key Laboratory of Space Applied Physics and Chemistry Shaanxi Key Laboratory of Condensed Matter Structures and PropertiesNorthwestern Polytechnical University

multiferroic materials,showing the coexistence and coupling of ferroelectric and magnetic orders,are of great technological and fundamental importance.However,the limitation of single phase multiferroics with robust magnetization and polarization hinders the magnetoelectric effect from being applied practically.Magnetic frustration,which can induce ferroelectricity,gives rise to multiferroic behavior.In this paper,we attempt to construct an artificial magnetically frustrated structure comprised of manganites to induce ferroelectricity.A disordered stacking of manganites is expected to result in frustration at interfaces.We report here that a tri-color multilayer structure comprised of non-ferroelectric La;Ca;MnO;（A）/Pr;Ca;MnO;（B）/Pr;Sr;MnO;（C） layers with the disordered arrangement of ABC-ACBCAB-CBA-BAC-BCA is prepared to form magnetoelectric multiferroics.The multilayer film exhibits evidence of ferroelectricity at room temperature,thus presenting a candidate for multiferroics.

关键词： multiferroic materials disordered stacking ferroelectricity

Sol-gel preparation of La-doped bismuth ferrite thin film and its low-temperature ferromagnetic and ferroelectric properties

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Journal of Rare Earths 2013年第1期31卷 60-64页

作者：严富学赵高扬宋娜 School of materials Science and Engineering Xi'an University of Technology

Bi0.85La0.15FeO3 thin film was prepared on ATO glass substrates by sol-gel technique. The effect of La doping on phase structure, film surface quality, ion valence, and ferroelectric/magnetic properties of Bio.85La0.15FeO3 film were investigated. La doping suppressed the formation of impurity phases and the transition of Fe3＋ to Fe2＋ ions at room temperature. Compared with the un-doped BiFeO3, La-doping also increased the average grain size and the film density, which resulted in the decrease of film leakage current density. The remanent polarization and saturation magnetization were enhanced significantly by La doping. The remanent polariza- tion of Bi0.85La0.15FeO3 films gradually decreased while saturation magnetization increased with the decrease of measuring tempera- ture within a range from 50 to 300 K.

关键词： multiferroic materials Bi0.85La0.15FeO3 thin films La doping remanent polarization saturation magnetization rare earths

STRUCTRUAL THEORIES OF multiferroic PLATES AND SHELLS

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STRUCTRUAL THEORIES OF MULTIFERROIC PLATES AND SHELLS

FREE VIBRATION OF multiferroic SIMPLY SUPPORTED CIRCULAR CYLINDRICAL PANELS

第二届亚洲功能材料与结构力学大会

作者： C.L.Zhang~1 W.Q.Chen~2 1 Department of Civil Engineering Zhejiang University Zijingang Campus Hangzhou 310058 2 Department of Engineering Mechanics Zhejiang University Yuquan Campus Hangzhou 310027

＜正＞Analogical to that for elastic plates as proposed by R.D.Mindlin,the linear structural theories of multiferroic plates and shells are derived using the series expansion method.In an orthogonal curvilinear coordinate system,the field of displacements is expanded in an infinite series of powers of the thickness-coordinate of the shell.The local coordinate of the thickness is introduced in the expansion of the fields of electric and magnetic potentials,which is different from the expansion of displacement.With the variational principle,we obtain two-dimensional governing equations and the associated boundary conditions of the shell.By setting the Lame coefficients corresponding to the coordinates at the middle surface of the shell to unit,and the two principal radii of the middle surface of the shell to infinity,the shell theory can directly be degenerated into the plate theory.

关键词： structural theory multiferroic materials plates shells series expansion

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FREE VIBRATION OF MULTIFERROIC SIMPLY SUPPORTED CIRCULAR CYL...