19/20T超高场STM-MFM-AFM组合显微镜新镜体及其对磁场与电流调控庞磁阻薄膜的研究

项目名称： 19/20T超高场STM-MFM-AFM组合显微镜新镜体及其对磁场与电流调控庞磁阻薄膜的研究

项目编号： No.11204306

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 侯玉斌

作者单位： 中国科学院合肥物质科学研究院

项目金额： 27万元

中文摘要： 多层结构的巨磁阻材料（GMR）已经在磁存储应用上获得了巨大的成功，而结构更简单的CMR具有更大的磁存储应用潜力，只是其产生磁阻效应的临界场太高而几乎得不到应用。要弄清CMR的磁阻行为机制，必须要弄清注入电流与CMR微观结构和磁结构的作用机制及其如何受磁场的影响。实际上，注入电流也确能改变和调制决定CMR物性的三要素：改变结构，改变电子态以及改变磁结构与行为。本项目将在我们自行研制成功的18T强磁场STM-MFM-AFM组合显微镜（简称SMA，我为主要建造人）基础上，对镜体部分做实质性改进，使原来的18T原子分辨率成像提升到19-20T；AFM/MFM测法也由调频非接触测量改为我组近期研制成功的高灵敏-高稳定的"反馈稳幅增速的调幅非接触测量"。更稳定、更精密、更高场的全新SMA将被应用于研究磁场与注入电流对庞磁阻单晶薄膜的微观局域磁结构与电子态的调控，揭示薄膜CMR的调控机理与应用潜力。

中文关键词： 扫描隧道显微镜；磁力显微镜；压电马达；强磁场；锰氧化物薄膜

英文摘要： Giant Magnetoresistive materials (GMR) of the multiplayer structure has been a great success in magnetic storage applications, and the CMR with more simple structure has a greater potential for magnetic storage applications, but it was almost cannot be applied because the critical field which is needed to produce magnetoresistance is too high. To find out the mechanism of CMR magnetoresistive behavior, we must find out the mechanism of the action of the injecting current and the microstructure and magnetic structure of the CMR, and how it was influenced by magnetic field. Actually, the injecting current indeed can change the and regulate the three elements which determine the properties of CMR: change the structure, change the electronic state and change the magnetic structure and behavior. In this project, Base on the 18T high magnetic field STM-MFM-AFM combo microscope(referred to SMA, I was a major biulder) which successfully constructed by ourelves, we will do substantial improvements for the core of the microscope and then make the SMA with atomic resolution imaging at 18T upgrade to 19-20T; the measurement method of the AFM/MFM was changed from frequency modulation non-contact measurement to "amplitude modulation non-contact measurement with feedback to steady amplitude and speed up" with high sensitivity

英文关键词： Scanning Tunneling Microscope；Magnetic Force Microscope；Piezoelectric Motor；High Magnetic field；Manganite Film