http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/13719 2026-05-17T21:57:20Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/13976 Magnetoelectric effect in magnetostrictionpiezoelectric multiferroics Bichurin M.I.; Petrov V.M. Present studies of magnetoelectric (ME) composite multiferroics are analyzed. In such materials the ME effect arises from magnetostriction and piezoelectric properties of components. The elastic mechanical interaction between magnetostriction and piezoelectric phases results in a giant magnetoelectric response in magnetoelectric composite materials. In the vicinity of electromechanical resonance the ME effect is enhanced more than by a factor of 100. Interest in possible construction of integrated devices has been provoked by recent nanostructural composites of ferroelectric and magnetic oxides prepared in the film-onsubstrate form. The ME interaction between ferroelectric and magnetic oxides of nanometers size is the same as that in common composite materials. Like bulk ME composites, the ME effect in nanocomposites may be applied in converters sensors, transducers, and in a variety of reproducing-recording devices. 2010-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/13975 Correlation of electron backscatter diffraction and piezoresponse force microscopy for the nanoscale characterization of ferroelectric domains in polycrystalline lead zirconate titanate Burnett T.L.; Weaver P.M.; Blackburn J.F.; Stewart M.; Cain M.G. The functional properties of ferroelectric ceramic bulk or thin film materials are strongly influenced by their nanostructure, crystallographic orientation, and structural geometry. In this paper, we show how, by combining textural analysis, through electron backscattered diffraction, with piezoresponse force microscopy, quantitative measurements of the piezoelectric properties can be made at a scale of 25 nm, smaller than the domain size. The combined technique is used to obtain data on the domain-resolved effective single crystal piezoelectric response of individual crystallites in Pb(Zr 0.4Ti0.6)O3 ceramics. The results offer insight into the science of domain engineering and provide a tool for the future development of new nanostructured ferroelectric materials for memory, nanoactuators, and sensors based on magnetoelectric multiferroics. © 2010 American Institute of Physics. 2010-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/13974 Reversible electric control of exchange bias in a multiferroic field-effect device Wu S.M.; Cybart S.A.; Yu P.; Rossell M.D.; Zhang J.X.; Ramesh R.; Dynes R.C. Electric-field control of magnetization has many potential applications in magnetic memory storage, sensors and spintronics. One approach to obtain this control is through multiferroic materials. Instead of using direct coupling between ferroelectric and ferromagnetic order parameters in a single-phase multiferroic material, which only shows a weak magnetoelectric effect, a unique method using indirect coupling through an intermediate antiferromagnetic order parameter can be used. In this article, we demonstrate electrical control of exchange bias using a field-effect device employing multiferroic (ferroelectric/antiferromagnetic) BiFeO 3 as the dielectric and ferromagnetic La 0.7 Sr 0.3 MnO 3 as the conducting channel; we can reversibly switch between two distinct exchange-bias states by switching the ferroelectric polarization of BiFeO 3. This is an important step towards controlling magnetization with electric fields, which may enable a new class of electrically controllable spintronic devices and provide a new basis for producing electrically controllable spin-polarized currents. © 2010 Macmillan Publishers Limited. All rights reserved. 2010-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/13973 Multiferroic and magnetoelectric materials-novel developments and perspectives Kleemann W.; Borisov P.; Bedanta S.; Shvartsman V.V. Magnetoelectric (ME) materials are of utmost interest in view of both fundamental understanding and novel desirable applications. Despite its smallness, the linear ME effect has been shown to control spintronic devices very efficiently, e.g., by using the classic ME antiferromagnet Cr 2O3. Similar nano-engineering concepts exist also for type-I multiferroic single phase materials like BiFeO3 and BiMnO 3. Record high ME response has been realized in stress-strain coupled multiphase magnetoelectrics like PZT/FeBSiC composites, enabling applications in sensors. In type-II multiferroics, whose ferroelectricity is due to modulated magnetic ordering, the ME coupling is of fundamental interest. Higher-order ME response characterizes disordered systems, which extend the conventional multiferroic scenario toward ME multiglass (e.g., Sr1-xMn xTiO3). © 2010 IEEE. 2010-01-01T00:00:00Z