南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (5): 774780.doi: 10.13232/j.cnki.jnju.2019.05.009
Haiyang Han,Longfei Jia,Ge Li,Baoshan Zhang,Dongming Tang,Yi Yang()
摘要:
磁性斯格明子(Skyrmion)是具有拓扑保护的涡旋磁结构,在实空间拥有非平庸拓扑特性,被认为是未来自旋电子器件的理想信息载体,关于斯格明子性质和应用的研究是目前学术界的热点.嵌套斯格明子(Skyrmionium)是一种特殊的磁性斯格明子结构,是由拓扑荷相反的两个斯格明子内外嵌套而成,具有总斯格明子数为零的特点,可以避免斯格明子霍尔效应.采用数值方法研究了纳米圆盘中嵌套斯格明子的自旋动力势效应,其在面内微波磁场激励下的旋转振荡模可以在纳米盘边缘产生显著的自旋相关电场.相比于传统的磁性斯格明子,嵌套斯格明子的集体振荡模式更加复杂,自旋相关电场源于拓扑荷为正区域、为负区域以及边缘区域集体贡献.嵌套斯格明子的集体振荡在纳米盘边缘产生的电压振幅达到了微伏量级,远大于传统磁性斯格明子产生的电压,便于直接测量.该工作对于基础物理和应用研究均有积极意义.
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