纳米复合磁体的界面结构、交换耦合和反磁化的研究进展

功能材料, 2016, 47(2): 2024-2035. doi: 10.3969/j.issn.1001-9731.2016.02.006

纳米复合磁体的界面结构、交换耦合和反磁化的研究进展

李柱柏 ^1, , 张雪峰 ^2, , 李永峰 ^3, , 刘艳丽 ^4, , 赵倩 ^5,

1.内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头,014010

2.内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010;内蒙古科技大学数理与生物工程学院,内蒙古包头014010

3.内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010;内蒙古科技大学数理与生物工程学院,内蒙古包头014010

4.内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010;内蒙古科技大学数理与生物工程学院,内蒙古包头014010

5.内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010;内蒙古科技大学数理与生物工程学院,内蒙古包头014010

基金项目: 国家自然科学基金资助项目(51461033) 内蒙古科技大学创新基金资助项目(2014QDL041)

关键词：纳米复合磁体 , 界面结构 , 交换耦合 , 原子扩散 , 反磁化

Research progress on the interface structure, exchange coupling and magnetization reversal in nanocomposite magnets

Keywords： nanocomposite magnets , interface structure , exchange coupling , atomic interdiffusion , magnetization reversal

纳米复合磁体的磁能积能得到大幅度提高,前提是晶粒之间存在良好的交换耦合作用,而交换耦合作用与软、硬磁相之间的界面密切相关.对Nd2Fe14B、Sm-Co、FePt基纳米复合磁体界面交换耦合和反磁化的研究展开论述.在不同的条件下,界面结构的匹配性、界面原子扩散、晶间的非晶相、界面非磁性层、界面晶格弛豫等可能有利于改善界面的结构、增强交换耦合作用,进而对反磁化过程产生影响.反磁化的不可逆过程主要发生在硬磁相内,但与软、硬磁相界面特性密切相关.不可逆反磁化在一定程度上决定了磁体的矫顽力,它可通过改善界面结构进行调控.本文旨在对纳米复合磁体界面的作用深入理解并期望能对磁体磁性能的优化提供参考.

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