反铁磁单晶超薄膜自旋结构和自旋输运研究

项目名称： 反铁磁单晶超薄膜自旋结构和自旋输运研究

项目编号： No.11274074

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 吴义政

作者单位： 复旦大学

项目金额： 93万元

中文摘要： 自旋电子学的进一步发展需要在新型材料中发现新的自旋输运效应。反铁磁薄膜材料在自旋电子器件中得到广泛应用， 主要利用了铁磁/反铁磁界面的交换耦合作用，但是反铁磁薄膜本身的自旋性质和自旋输运性质较少得到重视。本项目将利用分子束外延和激光分子束外延技术生长单晶反铁磁薄膜， 利用同步辐射技术探测反铁磁自旋性质及其调控方法,进一步探测反铁磁/铁磁异质结构交换耦合； 生长高质量的单晶反铁磁自旋阀和隧道结结构,利用交换耦合作用控制反铁磁自旋方向，研究其中自旋输运现象和物理机制，并设计新型的自旋电子器件。

中文关键词： 反铁磁薄膜；分子束外延；x光磁线二色效应；磁邻近效应；自旋相关输运

英文摘要： It is a vital task in spintronics research to find new type of materials and new-type spin-dependent transport effect. The antiferromagnetic films have been widely applied in the spintronic devices, which utilizes the exchange coupling effect at the antiferromagnetic/ferromagnetic interface, but little was paid attention on the spin-dependent transport properties in antiferromagnetic material. In this proposal, we will use the MBE technique and the Laser-MBE technique to grow the high-quality single crystalline antiferromagnetic film, and study its spin structure and manipulate the AFM spin structure with the strains by the synchrotron-related techniques， then we will further study the exchange coupling effect in single crystalline films. we will also prepare high-quality single crystalline antiferromagnetic spin valve system and the tunneling magnetic structures, and studying the spin-dependent transport phenomenon in the strtures using the exchange coupling effect to control the antiferromagnetic spin orientation. We believe that we can build up the correct relation between the antiferromangetic spin and the transport properties, and hopefully built new type spintronic devices.

英文关键词： antiferromangetic thin film；molecular beam epitaxy；x-ray linear dichroism effect；magneto proximity effect；spin-dependent transport