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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

Magnetoelectricity in multiferroics: a theoretical perspective

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National Science Review 2019年第4期6卷 629-641页

作者： Shuai Dong Hongjun Xiang Elbio Dagotto School of Physics Southeast University Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Physics and Department of Physics Fudan University Collaborative Innovation Center of Advanced Microstructures Department of Physics and Astronomy University of Tennessee Materials Science and Technology Division Oak Ridge National Laboratory

The key physical property of multiferroic materials is the existence of coupling between magnetism and polarization, i.e. magnetoelectricity. The origin and manifestations of magnetoelectricity can be very different in the available plethora of multiferroic systems, with multiple possible mechanisms hidden behind the phenomena. In this review, we describe the fundamental physics that causes magnetoelectricity from a theoretical viewpoint. The present review will focus on mainstream physical mechanisms in both single-phase multiferroics and magnetoelectric heterostructures. The most recent tendencies addressing possible new magnetoelectric mechanisms will also be briefly outlined.

关键词： multiferroics magnetoelectricity spin–orbit coupling spin–lattice coupling spin–charge coupling

Thermophysical properties of BiFeO_(3)/REE multiferroics in a wide temperature range

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Journal of Advanced Dielectrics 2020年第1期10卷 139-143页

作者： Sidek Khasbulatov Suleiman Kallaev Haji Gadjiev Zairbek Omarov Abumuslim Bakmaev Iliya Verbenko Aleksey Pavelko Larisa Reznichenko Research Institute of Physics Southern Federal University 194 Stachki Avenue Rostov-on-Don 344090Russia Department of Physical Electronics Chechen State University Grozny 364015 Chechen RepublicRussia H.I.Amirkhanov Institute of Physics of Daghestanian Scientific Center of the Russian Academy of Sciences Makhachkala Russia

The paper presents the results of a comprehensive study of the thermophysical properties(thermal conductivity,thermal diffusivity,heat capacity)of high-temperature multiferroic BiFeO_(3) modified with rare-earth elements(REEs)(La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Lu).The regularities of the formation of the mentioned characteristics were *** assumptions about the nature of the observed phenomena were suggested.

关键词： Ferroelectrics multiferroics ceramics bismuth ferrite thermophysical properties

multiferroics: a beautiful but challenging multi-polar world

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National Science Review 2019年第4期6卷 620-620页

作者： Ce-Wen Nan Jun-Ming Liu School of Materials Science and Engineering Tsinghua University Laboratory of Solid State Microstructures and Department of Physics Nanjing University

multiferroics simultaneously possess two or more primary ferroic orders, such as magnetic, ferroelectric, ferroelastic and ferrotoroidic orders. Cross-coupling among these multi-ferroic orders would result in new properties, such as a magnetoelectric effect that enables controlling magnetism using an electric field or controlling polarization remotely using a magnetic *** their discovery in the 1960s, multiferroic materials have constantly attracted attention and, especially since the 2000s,

关键词： domain multiferroics a beautiful but challenging multi-polar world

Studies of electrical conductivity and magnetic properties of Bi_(1-x)Gd_(x)FeO_(3) multiferroics

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Journal of Advanced Dielectrics 2014年第2期4卷 35-40页

作者： Samita Pattanayak R.N.P.Choudhary Piyush R.Das Multifunctional Material Research Laboratory Siksha‘O'Anusandhan UniversityBhubaneswar 751030India

The polycrystalline samples of Bi_(1-x)Gd_(x)FeO_(3)(x=0,0.1,and 0.2)muliferroic oxides have been synthesized by a solid-state reaction/mixed oxide *** preliminary X-ray structural analysis with room temperature diffraction data confirmed the formation of single-phase *** of room temperature scanning electron micrograph(SEM)of the surface of the above samples exhibits a uniform distribution of plate-and rod shaped grains throughout the sample surface with less *** dielectric behavior of the materials was studied in a wide range of frequency(1 kHz-1 MHz)and temperature(30-400℃).The nature of temperature dependence of de conductivity confirms the Arrhenius behavior of the *** frequency-temperature dependence of ac conductivity suggests that the material obeys Jonscher's universal power *** increase in Gd-content results in the enhancement of spontaneous magnetization BiFeO_(3)(BFO)due to the collapse of spin cycloid *** magnetoelectric coupling coefficient of BFO has been enhanced on Gd-substitution.

关键词： multiferroics dielectric properties electrical conductivity magnetic properties

Structural Transition and Magnetic Property of Bi1-xYbxFeO3

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Chinese Journal of Chemical Physics 2013年第2期26卷 157-162,I0003页

作者：郑亚男吴玉洁秦振兴陈晓嘉华南理工大学物理系广州510640 广州大学物理与电子工程学院广州510006

Bi1-xYbxFeO3（0〈x〈0.2） powders have been synthesized using a sol-gel method. The X- ray diffraction data show a structural transition from the rhombohedral R3c phase to the orthorhombic Pnma phase between x=0.1 and 0.125, which should induce a ferroelectric- paraelectric transformation. The phase transition is also proven by the Raman spectroscopy. A moderate signal on magnetization appears to illustrate the enhancement of magnetization at the transformation boundary, which is suggested to be the destruction of the spin cycloid structure at low concentration. The appearance of antiferromagnetic ordering is proposed to account for the afterward reduction of the magnetization at high concentration.

关键词： multiferroics Structural transition Magnetic property

Dielectric loss of half-doped manganite La_(0.5)Ca_(0.5)MnO_3

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Chinese Physics B 2013年第8期22卷 637-640页

作者：曹先胜吉高峰罗炳成李峰 School of Mathematics and Physics Changzhou University Department of Microelectronics State Key Laboratory of ASIC and Systems Fudan University Shaanxi Key Laboratory of Condensed Matter Structures and Properties School of Science Northwestern Polytechnical University

The dielectric loss tanfi of half-doped manganite ***3 is investigated using Green＇s function technique. The ***3 is described by the Kondo-lattice model in the double exchange limit, taking into account the Jahn- Teller distortion and the super-exchange interaction between the localized electrons. It is found that the intensity of tans decreases with increasing [e]TI, V, and U. It is also observed that the transition temperature Tp rises as l eJTI and U increase. It is worth noting that Tp remains unchanged and the strength of tans increases with increasing g. The calculated dielectric loss results are explained theoretically, and these behaviors are in qualitative agreement with the experimental results.

关键词： multiferroics dielectric loss Lao.sCao.sMnO3

Three-dimensional general magneto-electro-elastic finite element model for multiphysics nonlinear analysis of layered composites

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Applied Mathematics and Mechanics(English Edition) 2023年第1期44卷 53-72页

作者： Zheng GONG Yinxiao ZHANG Ernian PAN Chao ZHANG School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications Xi'an 710072China Civil Engineering and Institute of Pioneer Semiconductor Innovation Yang Ming Chiao Tung UniversityHsinchu 30010TaiwanChina School of Civil Aviation Northwestern Polytechnical UniversityXi'an 710072China

In this paper,by defining a general potential energy for the multiphase coupled multiferroics and applying the minimum energy principle,the coupled governing equations are *** system of equations is then discretized as a general three-dimensional(3D)finite element(FE)model based on the COMSOL *** validating the formulation,it is then applied to the analysis and design of the common sandwich structure of multiferroics *** the typical static loading,the effects of general lateral boundary conditions,material grading,nonlinearity,as well as polarization orientation on the composites are *** the magneto-electro-elastic(MEE)sandwich made of piezoelectric BaTiO_(3)and magnetostrictive CoFe_(2)O_(4)with different stacking sequences,various interesting features are observed which should be very helpful for the design of high-performance multiphase composites.

关键词： multiferroics sandwich composite magneto-electro-elastic(MEE)material multilayered plate nonlinear behavior

Multiferroic behaviour of epitaxial NiFe_2O_4-BaTiO_3 heterostructures

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Chinese Physics B 2008年第10期17卷 3910-3916页

作者：张毅邓朝勇马静林元华南策文 Department of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University

Multiferroic NiFe2O4 （NFO）-BaTiO3 （BTO） bilayered thin films are epitaxially grown on （001） Nb-doped SrTiO3 （STO） substrates by pulsed-laser deposition （PLD）. Different growth sequences of NFO and BTO on the substrate yield two kinds of epitaxial heterostructures with （001）-orientation, i.e. （001）-NFO/（001）-BTO/substrate and （001）- BTO/（001）-NFO/substrate. Microstructure studies from x-ray diffraction （XRD） and electron microscopies show differences between these two heterostructures, which result in different multiferroic behaviours. The heterostructured composite films exhibit good coexistence of both ferroelectric and ferromagnetic properties, in particular, obvious magnetoelectric （ME） effect on coupling response.

关键词： magnetoelectric effect epitaxial heterostructure nickel ferrite multiferroics