垂直磁各向异性(Co/Pd)n纳米单元阵列磁弛豫特性研究

项目名称： 垂直磁各向异性(Co/Pd)n纳米单元阵列磁弛豫特性研究

项目编号： No.51201081

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： 任杨

作者单位： 兰州大学

项目金额： 25万元

中文摘要： 高密度和高读写速率是目前信息存储技术的研究热点。本项目围绕超高密度磁存储中高速写入这一核心问题，以垂直磁各向异性Co/Pd结构的纳米单元为信息载体，以调节Co/Pd周期结构和纳米单元阵列构型为手段，以调控磁性材料的进动频率和阻尼因子为关键，系统研究磁纳米单元阵列的磁弛豫特性。拟用溅射和电子束刻蚀技术制备不同周期结构和阵列构型的Co/Pd纳米单元阵列，采用纳米磁光克尔、磁谱和电子自旋共振系统，结合磁力显微镜，系统研究磁滞回线、共振频率和线宽，及磁畴状态随其周期结构和阵列构型的变化关系。结合以上数据和理论模拟,分析Co/Pd纳米单元阵列磁化 、反磁化过程（静态）和高频磁响应（动态）随周期结构和阵列构型的变化规律,对比静、动态磁特性，深入研究垂直各向异性能和静磁相互作用改变时对纳米单元阵列的磁弛豫过程的调制作用，获得纳米单元阵列磁写入的最优参数，为超高密度磁存储的高速写入提供实验和理论依据。

中文关键词： (Co/Pd)n；垂直磁各向异性；纳米结构；磁弛豫过程；吉尔伯特阻尼因子

英文摘要： High memory density and high rate of reading and writing are now an extremely active area of research interest. In the project, how to improve the writing speed of the ultrahigh density magnetic recording is proposed as the main problem. We will investigate the magnetic relaxation of multilayered Co/Pd nanostructured array with perpendicular anisotropy. The multilayered Co/Pd nanostructures with various Co/Pd repeats and patternes will be fabricated using magnetron sputtering and electron beam lithography. The magneto-optical Kerr loops, the frequencies and peak-to-peak linewidths of ferromagnetic resonance with various repeats of Co/Pd and patternes could be investigated using focused MOKE system, magnetic spectrometer and electron spin-resonance system, respectively, and the magnetic domain wall structures could be measured by magnetic force microscope. Combining the experimental results with theoretical calculations, we could systematically study the regularity of the magnetization and reverse magnetization processes (static state) and high frequency magnetic responses (dynamic state) with the variations of Co/Pd repeats and patterned structures. Based on the comparison between the static and dynamic states, further research works are focused on realizing the magnetic relaxation of the nanostructures modulate

英文关键词： (Co/Pd)n；perpendicular anisotropy；nanostructure；magnetic relaxation；Gilbert damping factor