RUI: Magnetoelectric Effects in Multilayers of Magnetostrictive and Piezoelectric Perovskite Oxides

该个人研究者奖授予奥克兰大学本科学院的教授。该项目旨在制造和分析多层磁电（ME）复合材料，这些复合材料是智能传感器、执行器、信息存储介质和高频信号处理设备的潜在候选者。在由磁致伸缩相和压电相组成的复合材料中，可以通过磁致伸缩（MS）诱导的机械变形和压电（PE）效应诱导的电场两步过程来实现磁场到电场的转换。这项工作的动机是对MS和PE相多层复合材料中非常大的ME系数的理论预测，部分原因是由于增强的压电效应。努力将集中在由钙钛矿氧化物的交替层组成的复合材料上：(i)具有磁致伸缩的铁磁性镧锰酸盐和（ii）具有压电性的铁电锆钛酸铅。厚膜复合材料将采用博士刀技术合成，并对其电、磁、ME性能进行表征。拟议的研究将导致对多层膜中ME效应的理解。本项目的本科生将获得(i)材料理论知识和（ii）磁性和介电材料制备和表征方面的培训，为进入研究生教育或进入工业界做好充分准备。该个人研究者奖授予奥克兰大学本科学院的教授。它将支持对一类新材料的制备和特性的研究，这些材料将促进电场到磁场的转换或反之亦然。磁电（ME）复合材料由在磁场中变形的锰酸镧层和变形时产生电力的锆钛酸铅层组成。将制备厚膜复合材料，并对其结构、磁性、电学和ME性能进行表征。这些提议的研究可能会导致智能传感器、信号处理和存储设备的材料。本科生参与者将获得在基础和技术重要性材料的合成和表征方面的实践经验，这些技能将使他们在研究生教育或在工业研发岗位上取得成功。＊＊＊

This individual investigator award is to a professor at an undergraduate institution, Oakland University. The project is directed toward fabrication and analysis of multilayer magnetoelectric (ME) composites that are potential candidates for use as smart sensors, actuators, information storage media and high frequency signal processing devices. In composites consisting of magnetostrictive and piezoelectric phases, it is possible to accomplish magnetic field-to-electric field conversion with a two step process: magnetostriction (MS) induced mechanical deformation and piezoelectric (PE) effect induced electric fields. The work is motivated by theoretical predictions of a very large ME coefficient in multilayer composites of MS and PE phases, in part due to enhanced piezoelectric effects. Efforts will focus on composites consisting of alternate layers of the perovskite oxides: (i) ferromagnetic lanthanum manganites that are magnetostrictive and (ii) ferroelectric lead zirconate titanates that are piezoelectric. Thick film composites will be synthesized by doctor blade techniques and characterized in terms of their electrical, magnetic and ME properties. The proposed studies will to lead to an understanding of ME effects in multilayers. Undergraduate students in this project will acquire (i) knowledge in the theory of materials and (ii) training in preparation and characterization of magnetic and dielectric materials and will be well prepared for entry to graduate education or a career in industry. %%%This individual investigator award is to a professor at an undergraduate institution, Oakland University. It will support research into the preparation and characterization of a new class of materials that will facilitate the conversion of an electric field into a magnetic field or vice versa. Magnetoelectric (ME) composites consisting of alternate layers of lanthanum manganites that deform in a magnetic field and lead zirconate titanates that generate electricity when deformed will be studied. Thick film composites will be made and characterized in terms of their structural, magnetic, electrical and ME properties. The proposed studies are likely to lead to materials for smart sensors, signal processing, and memory devices. Undergraduate student participants will receive hands-on experience in the synthesis and characterization of materials of fundamental and technological importance, the skills that will allow them to be successful in graduate education or for employment in research and development positions in industry. ***