垂直各向异性GdFeCo金属薄膜的磁畴演化与大磁光效应

项目名称： 垂直各向异性GdFeCo金属薄膜的磁畴演化与大磁光效应

项目编号： No.51201179

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 何为

作者单位： 中国科学院物理研究所

项目金额： 25万元

中文摘要： 稀土过渡金属磁性薄膜GdFeCo同时具有垂直磁各向异性和巨大的磁光效应的特点。与其它金属超薄膜材料磁性材料不同，垂直各向异性不随薄膜厚度而迅速下降，这一独特的性质对超高密度磁存储和磁光存储具有重要的意义。但到目前为止，对非晶态RE-TM薄膜中的垂直磁各向异性起源的物理机制仍不清楚。本工作计划采用具有极高灵敏度的磁光效应，同时定量测量垂直磁化强度及平方项，确定磁化强度去想及其随外场和温度的演化过程。结合具有探测高阶各向异性参数的铁磁共振手段，研究垂直各向异性能的高阶各向异性项随温度变化的规律及其对磁畴结构变化的影响。该项研究不但有助理解这类材料的垂直磁各向异性的起源及其随薄膜厚度不敏感的原因，而且对开发同时具有垂直各向异性和磁光效应的材料有重要指导意义。

中文关键词： 垂直磁各向异性；稀土金属；铁磁共振；自旋动力学；磁光克尔效应

英文摘要： A great of attention has been played to explore the microstructure of magnetic domain and the magnetization reversal process in amorphous GdFeCo films duo its perpendicular magnetic anisotropy and large magneto-optical Kerr coefficient. The perpendicular magnetic anisotropy in GdFeCo can still keep when thickness is large than 100nm. It is still unknown for the origin of the perpendicular magnetic anisotropy in GdFeCo film. This project will employe high sensitive magneto-optical measurement to detect the both of the average of the reduced polar magnetization <Mz> and the average of square polar magnetization during the process of the magnetization reversal. The ferromagnetic resonance will be used to probe the perpendicular magnetic anisotropy including high order term with varied temperature. The evolutiong of the magnetic domain probed by Kerr microscopy will be present and discuss in the frame of the perpendicular magnetic anisotropy. Not only the first order of magnetic perpendicular anisotropy but also the second order will be counted. This work is helpful to understand the origin of the perpendicular magnetic anisotropy in GdFeCo films and offer great information for the potential application.

英文关键词： perpendicular magnetic anisotropy；rear earth metals；ferromagnetic resonance；spin dynamics；magneto-optical Kerr effect