State Key Laboratory of High Performance Ceramics and Superfine Microstructure,
Shanghai Institute of Ceramics, Chinese Academy of Sciences
中国科学院上海硅酸盐研究所 高性能陶瓷和超微结构国家重点实验室

Nonlinear magnetoelectric interactions in composite multiferroic structures

Prof. Yuri K. Fetisov

Department of Radio Engineering, Electronics and Automation, Moscow State Technical University, Russia

时间：2013年08月23日（星期五）下午14:00

地点：2号楼 607室

联系人：郑仁奎 研究员

欢迎各位老师同学光临!

　　Brief Introduction

　　Yuri K. Fetisov received the Ph.D. degree in solid state physics from the Moscow Engineering Physics Institute, Russia in 1981 and the Dr. Sci. degree in the physics of dielectrics and semiconductors from the Institute of Radio Engineering and Electronics of Russian Academy of Sciences, Moscow, in 1993.

　　He jointed the Moscow State Technical University of Radio Engineering, Electronics and Automation (MIREA) as a researcher in 1983. He was advanced to Professor of the Physics Department in 1994, Director of the Institute for Informatics of MIREA in 1998, and Dean of the Faculty of Electronics of MIREA in 2007. He has held visiting appointments as Visiting Researcher at Chiba University (1995), Bochum University (1999), as Visiting Professor at Colorado State University in (1995, 1997, 1999, 2001), Oakland University (2005, 2006, 2010, 2012), and University Paris-13 (2007, 2010).

　　At present he is a head of Research-educational center “Magnetoelectric Materials and Devices” at MIREA which is involved in research on ferromagnetic resonance, linear and non-linear spin wave processes in thin magnetic films, the magnetoelectric effect in multilayer composite structures, and design of solid state magnetic and microwave devices. Prof. Fetisov is a co-author of more than 120 papers in peer-review journals and numerous presentations at international conferences. He was a Senior Member of the IEEE in 1996-2008 and a Member of the Russian Academy of Natural Sciences since 2007.

　　Abstract

　　Magnetoelectric (ME) effects in composite structures consisting of ferromagnetic (FM) and piezoelectric (PE) layers are due to combination of magnetostriction and piezoelectricity by means of mechanical coupling between the layers. Most of the studies carried out to-date were devoted to investigation of linear ME effects in ac fields when response of the sample was measured at the frequency of excitation field and it was a linear function of the ac field. However, the FM materials are characterized by nonlinear magnetostriction vs field dependence λ(H) and PE materials are characterized by nonlinear piezoelectric module vs field dependence d(E) that can result in a variety of nonlinear ME effects.

　　The report presents simple theory for nonlinear ME interactions in FM-PE composites and provides its comparison with experimental data. In the voltage response of the composite under resonance excitation with ac magnetic fields, the theory predicts a dc voltage which proportional to the magnetostriction λ and its second derivative p with respect to the bias field H, an ac voltage due to linear ME effect which is proportional to the piezomagnetic coefficient q, and a third term due to nonlinear mixing of ac magnetic fields which is proportional to p. Doubling of the frequency and generation of voltages with sum and difference frequencies are expected due to nonlinearity of λ(H).

　　Nonlinear ME effects have been observed in composite structures with FM layers of amorphous magnetic film FeBSiC, Ni, and permendur (FeCoV alloy), and PE layers of lead zirconate titanate or langatate under excitation at frequencies of bending or planar acoustic oscillations of the structure.

　　Possible application of nonlinear ME interactions in composite structures such as heterodyne wide-band ac magnetic field sensors and the others will be discussed.