基于斯格明子薄膜的磁性隧道结制备及器件原理研究

项目名称： 基于斯格明子薄膜的磁性隧道结制备及器件原理研究

项目编号： No.51471183

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 王守国

作者单位： 北京科技大学

项目金额： 85万元

中文摘要： 磁性斯格明子是一类新型磁性材料，因其特殊的拓扑自旋结构和较低的临界翻转电流密度，展现出丰富的物理内涵和广阔的应用前景。本项目以磁性斯格明子薄膜和由此构成的磁性隧道结为研究对象，研究磁性斯格明子薄膜的结构和物性，主要包括自旋结构、自旋相关输运特性、临界翻转电流密度等。重点研究以斯格明子薄膜为基础的磁性隧道结，探索以斯格明子薄膜为铁磁电极、以非晶AlOx和单晶/准单晶MgO为势垒构建新型磁性隧道结的方法，优化高质量隧道结的制备工艺以提高磁电阻比值和改善相关的磁电性能；研究薄膜晶体结构、多层膜界面结构以及势垒层对自旋相关输运性质的影响，包括其磁电阻比值对温度、偏压的依赖关系等。本项目以磁性斯格明子薄膜材料的制备和新型磁性隧道结的优化为核心研究内容，重点解决斯格明子薄膜在材料制备、自旋结构观察、物性研究等方面的材料和物理问题，以及新型磁性隧道结在结构设计、材料优化和器件原理上的关键技术问题。

中文关键词： 磁性斯格明子薄膜；自旋电子学；磁性多层膜

英文摘要： A new type of magnetic materials called skyrmions, with special topological spin structures and low critical switching current, exhibits abundant physical phenomina and great potential applications in spintronic devices. This project is based on the magentic films with skyrmion spin structure (called skyrmion films) and on the novel magnetic tunnel junctions composed of skyrmion films. The research mainly inculdes the structures and physical properties, such as crystal structures, spin structures, spin dependent transport property, and critical switching current. The focus will be given to the magnetic tunnel junctions based on the skyrmion films, including the optimization of juncion fabrication, in order to increase the magnetoresistance ratio and some related magneto-electric properties. The effect of skyrmion structures,interfacial structures in multilayered system, and the barrier on the spin dependent transport properties will be investigated, including the MR ratio as a function of temperature and bias voltage. The main aim is to explore the methods to fabricate the magnetic tunnel junctions based on the skyrmion films together with barrier of amorphous AlOx and single-crystal MgO layer, with a focus on the deposition of skyrmion films and on the optimization of junctions. The key challenges is to solve some critical materials and physical issues of film depostion, observation of spin structures, transport properties, and to solve some problems for the future applications of skyrmion films and the related spintronic devices, such as materials design, optimization, and device principles.

英文关键词： Magnetic skyrmions;Spintronics;Magnetic multilayers