间隔层调控的各向异性软/硬磁纳米复合多层膜的磁性和层间耦合机制研究

项目名称： 间隔层调控的各向异性软/硬磁纳米复合多层膜的磁性和层间耦合机制研究

项目编号： No.51501033

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 崔伟斌

作者单位： 东北大学

项目金额： 21万元

中文摘要： 采用磁控溅射方法制备具有间隔层的软/硬磁纳米复合磁性薄膜。通过调整溅射气压、沉积温度和速率等参数调节微观结构和形貌，研究相应的磁畴结构的变化，并建立起这些因素与薄膜磁性变化的关系。通过在软/硬磁界面处引入间隔层，研究界面处结构和成分的变化。在固定间隔层厚度时，研究软硬磁层的磁晶各向异性和磁化强度等磁性参量、界面粗糙度和晶粒尺寸等微观组织对纳米复合磁性薄膜的矫顽力、矩形度和退磁过程的影响。通过改变间隔层的厚度，考察复合薄膜矫顽力、矩形度和退磁过程的变化，探索层间耦合的变化趋势并建立起定量关系。在归纳总结实验结果的基础上，构建微磁学模型，丰富各向异性交换耦合理论并为发展纳米复合永磁体提供指导。

中文关键词： 纳米复合永磁材料；耦合机制；磁晶各向异性；矫顽力机制

英文摘要： Spacered soft/hard-magnetic nanocomposite films will be prepared by magnetron sputtering. By tuning sputtering pressure, deposition temperature and ratios, microstructure and morphology as well as the magnetic domains of films will be studied. Their relationship with magnetic properties will be established. At the interface region between soft/hard-magnetic layers, the composition and local microstructure will be compared with and without spacer layer. In the nanocomposite films with spacer layers of fixed thickness, magnetic parameters, such as magnetocrystalline anisotropy and saturation magnetizations, and microstructural parameters, such as interface roughness and grain sizes, will influence the coercivity, squareness and demagnetization process. Their inter-relationship will be established. The effects of spacer layer thickness on the coercivities, squareness and demagnetization process will be studied. The quantitative dependence of exchange coupling stiffness on the thickness of spacer layer will be tentatively established. Based on the experimental results, micromagnetic models will be founded to contribute the theory of anisotropic exchange coupling and guide the development of nanocomposite magnets.

英文关键词： nanocomposite permanent magnets;coupling mechanism;magnetocrystalline anisotropy;coercivity mechanism