先进材料与纳米技术系学术报告6.8(Professor Petrov V.M)
发布时间: 2011-06-08 09:21:00
|
北京大学工学院 先进材料与纳米技术系学术报告 |
题目：Magnetoelectric characterization of magnetostrictive-piezoelectric nanostructures
报告人 Professor Petrov V.M
Novgorod State University, Russia
Email: bmi（at）mail.natm.ru
报告内容摘要
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.
主持人：董蜀湘 教授
时 间：6月8日（周三）下午 15:10
地 点：二教313
欢迎广大师生参加！