磁性、铁电多层膜的交换耦合、磁电耦合及其输运性质研究

项目名称： 磁性、铁电多层膜的交换耦合、磁电耦合及其输运性质研究

项目编号： No.51271177

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 刘伟

作者单位： 中国科学院金属研究所

项目金额： 80万元

中文摘要： 采用磁控溅射和脉冲激光沉积技术分别生长氧化物和金属薄膜，采用光刻技术和离子刻蚀技术制备隧道结，通过超导量子干涉仪(SQUID)和物性测量系统(PPMS)研究样品的磁电性能。在不同温度和磁场下用磁力显微镜观察铁磁/反铁磁/铁磁三层膜动态磁畴，同时借助于磁光科尔测量设备研究不同层的结构、界面磁矩分布等对三层膜的层间和界面耦合及磁输运的影响。研究铁磁/铁电双层和铁磁/铁电/铁磁三层膜体系中不同铁磁层和铁电层对磁电耦合效应的影响，实现用电控制磁。研究铁磁/铁电/铁磁隧道结体系中铁磁层电极和中间层的变化以及微观结构对隧道磁电阻TMR和电致电阻TER性能的影响。通过实验观察和理论分析，总结铁磁/铁电/铁磁三层膜体系中磁输运性能和铁磁/铁电材料之间的耦合性能以及隧道结中相关的磁电输运性能的特点，为进一步认清磁电耦合的本质提供的科学依据；同时也为该材料在实际中进一步的应用提供有效指导。

中文关键词： 磁性和铁电多层膜；交换耦合；磁电耦合；磁输运；电输运

英文摘要： The oxide and metal films are grown by pulsed laser deposition (PLD)and magnetro-sputtering respectively, and the tunnelling junctions are prepared by photolithography and Ion milling. Magnetic and magnetotransport properties were characterized by superconducting quantum interference device (SQUID) and physical property measurement system (PPMS).Dynamic magnetic domain of the Ferromagnetic(FM)/Antiferromagnetic(AFM)/Ferromagnetic(FM) trilayers are observed at different temperatures and field by magnetic force microscope. In the mean while, the effect of different layer structure and magnetic distribution of interface on interlayer and interface coupling and magnetic transort perperties are investigated with aid of surface magnetooptic Kerr effect on the trilayers. To realize electric control of magnetism, the effect of different ferromagnetic and ferroeclectric layers on magnetoelectric effects is investgated in FM/ferroelectric(FE) bilayers and FM/FE/FM trilayers. The effects of electrode of ferromagnetic layers, changes in spacelayer and microstractures on the tunneling magnetoresistance (TMR) and electroresistance (TER) effect are investigated in FM/FE/FM trilayers. The magnetic transport properties, coupling between ferromagnetic and ferroelectric materials and interrelated magnetic and electric trnsport pro

英文关键词： magnetic and ferroelectric multilayer；exchange coupling；magnetoelectric coupling；magnetotransport；electric transport