讲座题目：报告一：Magnetoelectric characterization of magnetostrictive-piezoelectric nanostructures

报告人：Professor Petrov V.M

报告二：On the theory of ferroelectric solid solutions  

报告人：Prof. A.Yu. Zakharov

时 间：6月8日（周三）下午 3:10
地 点：二教313
主持人：董蜀湘（教授）

报告一内容摘要：
     A model is presented for magnetoelectric (ME) effects in the region of electromechanical resonance (EMR) for ferrite-piezoelectric nanobilayers and nanopillars on a substrate or a template.  Influence of the lattice-mismatch on the material parameters and ME interactions has been taken into account using the classical Landau-Ginsburg-Devonshire phenomenological thermodynamic theory. The clamping effect of the substrate for nanobilayers and nanopillars or template for nanowires have been considered in determining the ME voltage coefficient. The model is applied to nickel ferrite-lead zirconate titanate nanostructures on strontium titanate substrate or template.  It is shown that the ME coupling strength decreases with increasing substrate or template volume fraction. For increasing thickness of substrate for a bilayer (i) the ME coefficient drops exponentially and (ii) EMR frequency increases. For nanopillars on a substrate, a fine structure is predicted in the ME voltage versus frequency profile.

报告人简介：
     Prof. Vladimir Petrov, Prof. of Dept. for Design and Technology of Radioequipment, Novgorod State University is specialist on theoretical modeling  and experimental investigation of magnetoelectric interaction phenomena in solids. His results on bulk and layered composites are published in such journals as Physical Review, Applied Physics Letters, Journal of Applied Physics and others. Past 2 - 3 years his efforts addressed the theory of magnetoelectric interaction in magnetostrictive-piezoelectric nanostructures.

报告二内容摘要：
    The report contains an application of lattice model to ferroelectric solid solutions. Short-range parts of interatomic potentials are taken into account by means the lattice structure introduction. Long-range parts are considered in effective field approximation. The equations for the mean values of the components contributions into polarization are derived. The general equation for the Curie temperature dependence on solution composition is obtained. Theoretical calculation of Curie temperature of the system  Pb1-xSnxTiO3 fulfilled.

报告人简介：
     Prof. Anatoly Yu. Zakharov,  Head of Dept. for Theoretical & Mathematical Physics, Novgorod State University is specialist in constructive methods in condensed matter physics. His results in theory of electronic structure in isovalent semiconductor solid solutions, quantum theory of electron transport in disordered systems, generalized lattice model of multicomponent systems, functional methods in classical statistical physics are well known. Past 3—4 years his efforts localized mainly on theory of multicomponent systems with inner degrees of freedom with application to magnetoelectric composites.