磁畴壁运动的电流或电场调控具有丰富的物理内涵，在新型存储器、逻辑器方面具有广阔的应用前景，是近年来自旋电子学领域的热点之一。目前磁畴壁的调控研究主要集中磁性金属当中，并且一般利用自旋极化电流调控，然而其需要的电流密度较高，由此引起的发热效应限制了此类器件性能的提高。钙钛矿锰氧化物由于其具有庞磁电阻效应等丰富的物理性质而引起了科学家们的广泛关注。本课题计划研究各种手段对锰氧化物中磁畴壁运动的调控规律。由于扫描探针显微镜（SPM）是纳米尺度下探测与操控材料表面结构与性质的有力工具，本课题将重点研究在SPM针尖上加电流或电压对锰氧化物中磁畴壁运动的调控及其机制。此外，还将研究微波、应变、样品微结构的几何特征对磁畴壁运动的影响规律。由于锰氧化物的强关联电子特性以及SPM在纳米领域的独特技术优势，本课题的研究将对磁动力学机制的理解以及多功能、小尺寸的自旋电子学器件的研发有重要意义。

Controlled manipulation of magnetic domain wall (DW) motion by electric current/field is a subject of intensive studies in spintronics because of its fundamental interest and promising potential for the new-generation of memory, logic devices. Up to now, most of preious studies in this respect have focused on the magnetic metal, and the spin-polarized current is the control parameter commonly used for the manipulation of magnetic DW motion. However, the Joule thermal effect due to the excess high current density is a bottleneck for the improvement of the related device performance. Thus, it is should be interesting and important to extend this study to other material or to find new effective control methods and principles. Perovskite manganite has attracted extensive attention because of its rich physics and potential applications since the discovery of colossal magnetoresistance. In this project, we will perform a study on the controlled manipulation of the magnetic DW motion in manganites by using different control means, which is aimed to reveal the underlying physics behind the DW movement and explore the novel effect for applications. As is well known, the Scanning Probe microscope (SPM) is a powerful tool for detecting and controlling the surface structures and properties of materials at nanometer scale. In this project, more efforts will be put to the study on the motion of the magnetic DW driven by applying current/voltage on the SPM-probe. And the related underlying physics will also be analyzed. Additionally, the effects of microwave, strain and the detail geometry feature of microstructure on the magnetic DW motion will be investigated. Due to the distinctive feature of the coupling between spin, charge and lattice in manganites as well as the unique technological advantages of SPM at nanometer scale, research performed in this project will have important implications for both the understanding of magnetization dynamic and the explorations of the small-size devices with multi-functionalities.