项目名称： 具有可转动磁各向异性磁性薄膜的GHz下高磁导率机制研究

项目编号： No.51471080

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： 柴国志

作者单位： 兰州大学

项目金额： 82万元

中文摘要： 可控的微波信号处理器件要求磁性薄膜具有在GHz下的高磁导率，并且要求其磁导率和共振频率在位可调。由于可转动磁各向异性的易磁化方向可随角度的改变而改变，因此有望利用可转动磁各向异性解决这一难题。本项目拟用磁控溅射技术制备具有可转动磁各向异性的单层膜、复合膜和多层膜。利用角度分辨的高频磁导率测试系统对磁性薄膜材料的高频磁导率和共振频率进行测量和分析，得到其中的可转动磁各向异性。结合结构和静态磁性测试，利用微磁学模拟方法系统研究和分析磁性薄膜中可转动磁各向异性的形成机理，寻找出利用可转动磁各向异性提高薄膜共振频率和磁导率的方法,结合磁性薄膜中传统的单轴、单向磁各向异性，对薄膜材料的高频磁导率和共振频率进行优化。对可转动磁各向异性的研究不仅可以获得具有磁导率角度可调的高共振频率、高微波磁导率的磁性薄膜，而且也将完善磁性薄膜中磁各向异性的理论体系,为高频磁性薄膜的制备和后续研究提供理论和技术指导。

中文关键词： 磁各向异性；磁性薄膜；高频磁性；磁性多层膜；微结构

英文摘要： Magnetic thin films with tunable microwave magnetic properties are very useful for tunable microwave signal processing devices. Rotatable anisotropy, whose direction can be rotated by a large saturated field, may be a candidate to achieve the tunable high frequency permeability in the magnetic thin films. This project is going to optimize the high frequency properties of magnetic thin films by using the rotatable anisotropy. The key point is to study the rotatable anisotropy in different magnetic thin film system. The magnetic monolayer, composite and multilayer thin films will be deposited by using the magnetron sputtering system. Combining with the structure and morphology investigation, we will study the preparation of the magnetic thin films with a rotatable magnetic anisotropy. We will also studying the macro and micro, static and high-frequency magnetic properties of the magnetic thin films, especially using the angle-resolved high-frequency magnetic permeability spectra technique with vector network analyzer and ferromagnetic resonance to study the high-frequency magnetic permeability and magnetic resonance frequency of the thin film, then obtain the rotatable magnetic anisotropy by anlyses the high frequency permeability spectra. Then the intrinsic and extrinsic magnetic properties will be fully studied. We will then study and analysis the origin and the mechanism of the rotatable anisotropy in magnetic thin films combine with the micromagnetic simulation. We will find out a way to improve the resonance frequency and high freqeuncy permeability by increase the rotatable anisotropy in magnetic thin films. Based on fully study the rotatable anisotropy in magnetic thin films, combining with the conventional magnetic anisotropy of the magnetic thin films, we will optimize the high frequency permeability and the resonance frequency of the magnetic thin film. This project will provide magnetic thin films with its high frequency properties angular adjustable. And this project will also improve the theory of the magnetic anisotropy in magnetic thin films. It is very useful to provide the theoretical and technical basis for the high frequency magnetic thin films preparations and applications.

英文关键词： Magnetic anisotropy;Magnetic thin films;High freqeuncy magnetic properties;Magnetic multilayers;Micro-structures