(1. 中南大学 物理科学与技术学院， 长沙 410083；
2. 中南大学 粉末冶金国家重点实验室， 长沙 410083)
摘 要: 采用微磁学模拟的方法对不同直径有限长Ni纳米线的矫顽力随角度（外磁场与纳米线长轴之间的夹角）的变化关系Hc(θ)进行了研究。 结果表明： 矫顽力随角度的变化规律随着纳米线直径的增大而改变； 当直径小于临界直径d0(39 nm)时， 纳米线矫顽力随着角度的增大而单调减小； 当直径大于临界直径d0时， 矫顽力随角度的变化表现出较复杂的关系， 出现零角度局域极大现象以及中间某一角度的极大现象。 从反磁化机制的角度对矫顽力随角度的变化规律进行了解释。
关键字: 镍纳米线; 微磁学; 矫顽力; 角度; 反磁化机制
magnetic nanowires
（1. School of Physics Science and Technology, Central South University,
Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University,
Changsha 410083, China）
Abstract: Angular dependence of the coercivity Hc(θ) of magnetic nanowires with different diameters was investigated by micromagnetic simulation, where θ is defined as the angle between the field direction and wire length）. The results show that Hc(θ) significantly depends on the nanowire diameter. For the nanowire diameter smaller than a critical diameter d0(39 nm), the coercivity decreases as the angle increases. For the diameters larger than the critical diameter, the angular dependence of coercivity has a complicated form. There are a local maximum at zero angle and a peek at middle angle on the Hc(θ) curve. The angular dependence of coercivity is interpreted in terms of magnetization reversal mechanism.
Key words: Ni nanowire; micromagnetics; coercivity; angle; magnetization reversal mechanism
