物理学报2012，Vol.61Issue(10)：398-404,7.
消磁场对纳米铁磁线磁畴壁动力学行为的影响
Influences of the demagnetizing field on dynamic behaviors of the magnetic domain wall in ferromagnetic nanowires
摘要
Abstract
Understanding of magnetic domain wall dynamic behavior is one of the important issues in the realization of spintronic device based on domain wall motion. We investigate the dynamic behaviors of the magnetic domain wall propagation in L-shaped ferro- magnetic nanowires under external magnetic driving fields. By micromagnetic simulation, we observe a dynamic characteristic of the magnetic domain wall in a ferromagnetic nanowire with varying the external field. By changing the nanowire thickness, we examine the influence of the demagnetizing field from the nanowire surface on the domain wall dynamics under a magnetic driving field after Walker breakdown field. Using an auxilliary magnetic field perpendicular to the nanowires, we analyze the effect of the demagnetizing field on the domain wall dynamic behaviors. The results show that the stronger external field or the thicker nanowire can enhance the generation of the demagnetizing field on the nanowire surface, leading to the occurrence of the Walker breakdown phenomenon with the periodic change of the inner spin structure of the domain wall during the domain wall propagation in the nanowires. By using an auxilliary magnetic field perpendicular to the nanowires, we find that the strength and the direction of the demagnetizing field can be modulated. It implies that the dynamic behavior of domain wall propagation in the nanowire is controllable.关键词
铁磁性纳米线/磁畴壁运动/Walker崩溃/微磁学模拟Key words
ferromagnetic nanowire/magnetic domain wall motion/Walker breakdown/micromagnetic simulation分类
数理科学引用本文复制引用
范喆,马晓萍,李尚赫,沈帝虎,朴红光,金东炫..消磁场对纳米铁磁线磁畴壁动力学行为的影响[J].物理学报,2012,61(10):398-404,7.基金项目
韩国国家研究基金（批准号：2010-0004535,2010.0021735）资助的课题. （）
