Wide-Band Magnetoelectric Interactions in Single Crystal Multiferroic Bilayers

单晶多铁双层中的宽带磁电相互作用

• 批准号: 0606153
• 负责人: Gopalan Srinivasan
• 金额: $ 22.5万
• 依托单位: Oakland University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0606153&HistoricalAwards=false
• 关键词: Wide; Band; Magnetoelectric; Interactions; Single

****NON-TECHNICAL ABSTRACT*****Materials that are capable of magnetic field-to-electric field conversion are potentially useful for a variety of technologies. There are few such magneto-electric materials in nature and most of them have a low efficiency when converting fields. This research is aimed at artificial composite materials with excellent conversion properties. The composites will be made by bonding plates of ferrites, which deform in a magnetic field, together with ferroelectrics, which produce an electric field when deformed. The field conversion properties will be studied over a wide frequency range for information on their use in consumer electronics, communication devices, and radar systems. These projects will provide research training for personnel at all levels, from high school sophomores to post doctoral associates.**** TECHNICAL ABSTRACT*****A comprehensive research program is planned on wide-band magnetoelectric (ME) interactions in bilayers of single crystal ferrites and ferroelectrics. The electromagnetic coupling in such systems is mediated by mechanical stress: magnetostriction induced mechanical deformation and the piezoelectric effect induced electric fields. Theories predict orders of magnitude stronger ME interactions in single crystals compared to polycrystalline multilayers. The primary tasks and goals are as follows. (i) The fabrication of bilayers consisting of spinel ferrites and piezoelectrics by bonding techniques. (ii) Measurement and analysis of ME dispersion characteristics, including Maxwell-Wagner relaxation, and low-frequency ME effects. (iii) Investigations on resonant ME effect when the electric and magnetic subsystems show resonance behavior. Human resource development will involve personnel at all levels, from high school students to research associates. The ME materials are potential candidates for magnetoelectric memory devices, magnetic field sensors, electrically controlled magnetic devices, and magnetically controlled piezoelectric devices.

****非技术摘要*****能够具有磁场到电场转换的材料对各种技术都有可能有用。 自然界中，这种磁电材料很少，并且大多数转换场时的效率低。 这项研究针对具有出色转换特性的人造复合材料。 复合材料将通过铁氧体的粘结板与铁电磁场变形的铁氧体的粘结板以及铁电型，后者在变形时会产生电场。 将在广泛的频率范围内研究现场转换属性，以获取有关它们在消费电子，通信设备和雷达系统中使用的信息。 这些项目将为各级人员提供研究培训，从高中大二到博士学位。此类系统中的电磁耦合是由机械应力介导的：磁性诱导的机械变形和压电效应诱导的电场。与多晶多层人群相比，理论预测单晶中ME相互作用的数量级更强。主要任务和目标如下。 （i）通过粘结技术由尖晶石铁氧体和压电组成的双层制造。 （ii）测量和分析ME分散特征，包括Maxwell-Wagner松弛和低频ME效应。 （iii）当电气和磁性子系统显示共振行为时，对共鸣效应的研究。 从高中生到研究员工，人力资源开发将涉及各级人员。 ME材料是磁电存储设备，磁场传感器，电气控制磁性设备和磁控压电设备的潜在候选物。