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Journal of Rare Earths 2016年第12期34卷 1228-1234页

作者：郭凯鑫张荣芬何腾鹏孔汉东邓朝勇 Key Laboratory of Electronic Composites of Guizhou Province College of Big Data and Information Engineering Guizhou University Yangming Collage Guizhou University

Single-phase multiferroic BiFeO3 and Bi（0.9）（La/Nd）（0.1）FeO3（doped with rare earth ions La-（3＋） and Nd-（3＋）） films grown on（111）-Pt/Ti/SiO2/Si substrate were prepared via sol-gel method and a subsequent rapid thermal process. The phase composition, microstructure, ferroelectric, dielectric, ferromagnetic properties were investigated, and meanwhile, the in-plane magnetoelectric（ME） coupling effects of the films were reported and studied for the first time in this work. Structural characterization by X-ray diffraction and scanning electron microscopy showed that both BiFeO3 and Bi（0.9）（La/Nd）（0.1）FeO3 exhabited a rhombohedral structure with（111） preferred orientation. The results of the physical properties indicated that the introduction of rare earth ions improved significantly the polarization, magnetization and dielectric properties than the undoped BiFeO3 crystals, and it enhanced effectively the in-plane ME coupling（the ME coupling coefficient αE increased from 0.13 in the pure BiFeO3 to 0.21 in Bi（0.9）La（0.1）FeO3 and 0.34 V/（Oe·cm） in Bi（0.9）Nd（0.1）FeO3）. The mechanism of these phenomena was investigated systematically.

关键词： bismuth ferrite substitution rare earth ions ferroelectricity dielectricity ferromagnetism magnetoelectric coupling

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Enhancing the magnetoelectric coupling of Co4Nb2O9[100] by substituting Mg for Co

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Frontiers of physics 2018年第5期13卷 73-78页

作者： Zhen Li Yi-Ming Cao Yin Wang Ya Yang Mao-Lin Xiang You-Shuang Yu Bao-Juan Kang Jin-Cang Zhang Shi-Xun Cao Department of Physics International Center for Quantum and Molecular Structures and Materials Genome Institute Shanghai University Shanghai 200444 China Center for Magnetic Materials Devices Key Laboratory for Advanced Functional and Low Dimensional Materials of Yunnan Higher Education Institute Qujing Normal University Qujing 655011 China School of Physics and Electronic Engineering Xinyang Normal University Xinyang 464000 China

We report experimental studies on enhancing the magnetoelectric （ME） coupling of Co4Nb2O9 by sub- stituting the non-magnetic metal Mg for Co. A series of single crystal Co4-xMgxNb2O9 （x = 0, 1, 2, 3） with a single-phase corundum-type structure are synthesized using the optical floating zone method, and the good quality and crystallographic orientations of the synthesized samples are confirmed by the Laue spots and sharp XRD peaks. Although the Neel temperatures （TN） of the Mg substituted crystals decrease slightly from 27 K for pure C04Nb2O9 to 19 K and 11 K for Co3MgNb2O9 and Co2Mg2Nb2O9, respectively, the ME coupling is doubly enhanced by Mg substitution when x = 1. The ME coefficient OlMg of Co3MgNb2O9 required for the magnetic field （electric field） control of electric polarization （magnetization） is measured to be 12.8 ps/m （13.7 ps/m）. These results indicate that the Mg substituted Co4-xMgxNb2O9 （x = 1） could serve as a potential candidate material for applications in future logic spintronics and logic devices.

关键词： single crystal magnetoelectric coupling substitution

magnetoelectric coupling of multilayered Pb(Zr0.52Ti0.48)O3-CoFe2O4 film by piezoresponse force microscopy under magnetic field

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Magnetoelectric coupling of multilayered Pb(Zr0.52Ti0.48)O3-...

Effect of Interface Area on Nonlinear magnetoelectric Resonance Response of Layered Multiferroic Composite Ring

第十二届全国物理力学学术会议

作者： S.-H.Xie Y.-M.Liu J.-Y.Li Faculty of Materials Optoelectronics and Physicsand Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of EducationXiangtan University Department of Mechanical Engineering University of Washington

Multiferroic Pb(ZrTi)O-CoFeO-Pb(ZrTi)O(PCP) laminated film has been synthesized by sol-gel process and spin coating,with the spinel structure of CoFeO and perovskite structure of Pb(ZrTi)O verified by X-ray diffraction.The good multiferroic properties of PCP film have been confirmed by ferroelectric and magnetic hysteresis loops,with leakage current substantially reduced.The local magnetoelectric(ME) coupling has been verified using piezoresponse force microscopy under external magnetic field,showing magnetically induced evolution of piezoresponse and ferroelectric switching characteristics,with piezoresponse amplitude reduced and coercive voltage increased.Such technique will be useful in characterizing local ME couplings for a wide range of multiferroic materials.

关键词： multiferroic laminated film piezoresponse force microscopy magnetoelectric coupling

来源： cnki会议评论

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Acta Mechanica Solida Sinica 2022年第5期35卷 765-774页

作者： Jingyi Liu Lianchun Long Wei Li Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China

Multiferroic composite structures are widely used in sensing,driving and communication.The study of their magnetoelectric(ME)behavior under various excitations is crucial.This study investigates the nonlinear ME influence of a multilayer composite ring structure consisting of Terfenol-D(TD)magnetostrictive and lead zirconate titanate(PZT)piezoelectric rings utilizing a multiphysics field modeling framework based on the fully coupled finite element method.The ME coupling coefficient of the PZT/TD concentric composite ring is predicted using the linear piezoelectric constitutive model and the nonlinear magnetostrictive constitutive model,which is congruent to the experimental data.The effect of the interface area of a trilayered structure on the coupling performance at the resonant frequency is investigated,considering the magnitude and frequency of the magnetic field and keeping the material ratio constant.The ME coupling coefficient of a trilayered structure is larger than that of a bilayered structure with the same material ratio,and the maximum ME coupling coefficient of a trilayered structure increases nonlinearly with the increase in the interface area.At the resonant frequency,the structure's ME coupling performance is considerably improved.An optimization technique based on structural geometric design and magnetic field control is presented to optimize the ME coupling coefficient.

关键词： Composite multiferroics magnetoelectric coupling Finite element simulation Interface area Frequency

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 mechanisms.When scaling down conventional complementary metal-oxide semiconductor(CMOS)devices,increased heating dissipation becomes a top concern.Combining the highly correlated ferroic orders,notably the strongly coupled interfacial magnetoelectric(ME)interactions,may lead to devices beyond CMOS.These devices use the electric field to regulate magnetization,which opens up the prospect of downsizing,improved performance,and lower power consumption.To 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 explored.Five classic mechanisms are demonstrated:strain,exchange bias,orbital reconstruction,and the electrostatic and electrochemical.The encouraging photovoltaic approach is also discussed.Each method’s capabilities and application scenarios are compared.Analyses of the comprehensive gating results of different magnetic coupling effects such as perpendicular magnetic anisotropy(PMA)and Ruderman-Kittel-Kasuya-Yosida(RKKY)are additionally made.At 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 selection.These 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

Improving solar control of magnetism in ternary organic photovoltaic system with enhanced photo-induced electrons doping

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Nano Research 2022年第3期15卷 2626-2633页

作者： Yujing Du Shiping Wang Lei Wang Shengye Jin Yifan Zhao Tai Min Zhuangde Jiang Ziyao Zhou Ming Liu Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and Engineeringthe International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologyXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory for Manufacturing Systems Engineering Collaborative Innovation Center of High-End Manufacturing Equipmentthe International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologyXi'an Jiaotong UniversityXi'an 710049China

§The growing demand for storage space has promoted in-depth research on magnetic performance regulation in an energy-saving way.Recently,we developed a solar control of magnetism,allowing the magnetic moment to be manipulated by sunlight instead of the magnetic field,current,or laser.Here,binary and ternary photoactive systems with different photon-to-electron conversions are proposed.The photovoltaic/magnetic heterostructures with a ternary system induce larger magnetic changes due to higher short current density(J SC)(20.92 mA·cm^(−2))compared with the binary system(11.94 mA·cm^(−2)).During the sunlight illumination,ferromagnetic resonance(FMR)shift increases by 80%(from 169.52 to 305.48 Oe)attributed to enhanced photo-induced electrons doping,and the variation of saturation magnetization(M S)is also amplified by 14%(from 9.9%to 11.3%).Furthermore,photovoltaic performance analysis and the transient absorption(TA)spectra indicate that the current density plays a major role in visible light manipulating magnetism.These findings clarify the laws of sunlight control of magnetism and lay the foundation for the next generation solar-driven magneto-optical memory applications.

关键词： multiferroic heterostructure magnetoelectric coupling ferromagnetic resonance magnetic anisotropy interface charge doping

Magnetic field regulation of mouse bone marrow mesenchymal stem cell behaviours on TiO2 nanotubes via surface potential mediated by Terfenol‐D/P(VDF‐TrFE) film

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Biosurface and Biotribology 2022年第3期8卷 254-265页

作者： Haisheng Qi Qi Ke Qiwen Tang Lei Yin Lixin Yang Chengyun Ning Jianyu Su Liming Fang School of Materials Science and Engineering South China University of TechnologyGuangzhouChina National Engineering Research Center for Tissue Restoration and Reconstruction GuangzhouChina China‐Singapore International Joint Research Institute GuangzhouChina School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhouChina Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing GuangzhouChina

It is challenging to match the mutual interactions between implant and host because the biomaterials usually cannot actively adjust their performance to the changing microenvironment.Surface potential is one of the critical factors affecting the bioactivity of biomaterials,but it is difficult to be directly controlled in vivo.Magnetic stimulation has attracted much attention due to its deep penetrability,good reliability,and convenient operability.Here,titanium dioxide(TiO_(2))nanotubes and Terfenol‐D/P(VDF‐TrFE)composite film are prepared by anodic oxidation and solution casting methods on opposite sides of a titanium sheet,respectively.Terfenol‐D magnetostrictive microparticles deform under a magnetic field,generating surface potential on the P(VDF‐TrFE)piezoelectric matrix through magneto‐electric coupling.Correspondingly,equal opposite charges are induced on the surface of TiO_(2) nanotubes.Stem cells cultured on TiO_(2) nanotubes show that cell adhesion,proliferation,and differentiation abilities can be regulated by magnetic strength,which correlates with the absorption of charged proteins.Therefore,a cascade coupling of magnetic,mechanical,electric,biochemical,and cellular effects is established.This work demonstrates the feasibility of regulating the bioactivity of biomaterials in vivo through a magnetic field.

关键词： cell behaviours magnetic stimulation magnetoelectric coupling magnetostriction piezoelectricity surface potential TiO_(2)nanotube

Single-phase multiferroics: new materials, phenomena,and physics

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National Science Review 2019年第4期6卷 653-668页

作者： Chengliang Lu Menghao Wu Lin Lin Jun-Ming Liu School of Physics &Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Laboratory of Solid State Microstructures Nanjing University Institute for Advanced Materials Hubei Normal University

Multiferroics, where multiple ferroic orders coexist and are intimately coupled, promise novel applications in conceptually new devices on one hand, and on the other hand provide fascinating physics that is distinctly different from the physics of high-TCsuperconductors and colossal magnetoresistance manganites. In this mini-review, we highlight the recent progress of single-phase multiferroics in the exploration of new materials, efficient roadmaps for functionality enhancement, new phenomena beyond magnetoelectric coupling, and underlying novel physics. In the meantime, a slightly more detailed description is given of several multiferroics with ferrimagnetic orders and double-layered perovskite structure and also of recently emerging 2 D multiferroics. Some emergent phenomena such as topological vortex domain structure, non-reciprocal response, and hybrid mechanisms for multiferroicity engineering and magnetoelectric coupling in various types of multiferroics will be briefly reviewed.

关键词： multiferroics magnetoelectric coupling non-reciprocity topological domain structure 2D multiferroics

Topological domain states and magnetoelectric properties in multiferroic nanostructures

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National Science Review 2019年第4期6卷 684-702页

作者： Guo Tian Wenda Yang Deyang Chen Zhen Fan Zhipeng Hou Marin Alexe Xingsen Gao Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials and Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal University Department of Physics University of Warwick

Multiferroic nanostructures have been attracting tremendous attention over the past decade, due to their rich cross-coupling effects and prospective electronic applications. In particular, the emergence of some exotic phenomena in size-confined multiferroic systems, including topological domain states such as vortices, center domains, and skyrmion bubble domains, has opened a new avenue to a number of intriguing physical properties and functionalities, and thus underpins a wide range of applications in future nanoelectronic devices. It is also highly appreciated that nano-domain engineering provides a pathway to control the magnetoelectric properties, which is promising for future energy-efficient spintronic devices. In recent years, this field, still in its infancy, has witnessed a rapid development and a number of challenges too.In this article, we shall review the recent advances in the emergent domain-related exotic phenomena in multiferroic nanostructures. Specific attention is paid to the topological domain structures and related novel physical behaviors as well as the electric-field-driven magnetic switching via domain engineering. This review will end with a discussion of future challenges and potential directions.

关键词： topological defects ferroelectric domains multiferroic nanostructures magnetoelectric coupling

Strain-mediated magnetoelectric control of tunneling magnetoresistance in magnetic tunneling junction/ferroelectric hybrid structures

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Chinese Physics B 2022年第9期31卷 532-539页

作者：黄文宇王藏敏刘艺超王绍庭葛威锋仇怀利杨远俊张霆张汇高琛 School of Physics Hefei University of TechnologyHefei 230009China School of Microelectronics Hefei University of TechnologyHefei 230009China Hefei National Laboratory for Physical Sciences at Microscale(HFNL) University of Science and Technology of ChinaHefei 230026China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Because of the wide selectivity of ferromagnetic and ferroelectric(FE)components,electric-field(E-field)control of magnetism via strain mediation can be easily realized through composite multiferroic heterostructures.Here,an MgO-based magnetic tunnel junction(MTJ)is chosen rationally as the ferromagnetic constitution and a high-activity(001)-Pb(Mg_(1/3)Nb_(2/3))_(0.7)Ti_(0.3)O_(3)(PMN-0.3PT)single crystal is selected as the FE component to create a multiferroic MTJ/FE hybrid structure.The shape of tunneling magnetoresistance(TMR)versus in situ E-fields imprints the butterfly loop of the piezo-strain of the FE without magnetic-field bias.The E-field-controlled change in the TMR ratio is up to-0.27%without magnetic-field bias.Moreover,when a typical magnetic field(~±10 Oe)is applied along the minor axis of the MTJ,the butterfly loop is changed significantly by the E-fields relative to that without magnetic-field bias.This suggests that the E-field-controlled junction resistance is spin-dependent and correlated with magnetization switching in the free layer of the MTJ.In addition,based on such a multiferroic heterostructure,a strain-gauge factor up to approximately 40 is achieved,which decreases further with a sign change from positive to negative with increasing magnetic fields.This multiferroic hybrid structure is a promising avenue to control TMR through E-fields in low-power-consumption spintronic and straintronic devices at room temperature.

关键词： tunneling magnetoresistance magneti tunnel junction(MTJ) multiferroic heterostructure magnetoelectric coupling

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