Magnetization Reversal for Ni Nanowires Studied by Micromagnetic Simulations  

作　　者：Nianmei Hen Guanghua Guo Lamei Zhang Guangfu Zhang Wenbin Song 

机构地区：[1]School of Physics Science and Technology, Central South University, Changsha 410083, China [2]State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China

出　　处：《Journal of Materials Science & Technology》2009年第2期151-154,共4页材料科学技术（英文版）

基　　金：supported by the National Natural Sci-ence Foundation of China under Grant No. 60571043; the Natural Science Foundation of Hunan Provinceof China under Grant No. 04JJ3078.

摘　　要：The magnetization reversal mechanisms for Ni nanowires with different diameters were investigated by micromagnetic simulations. The results show that the reversal mechanisms are significantly dependeht on the diameter of wire. For very thin wires, the reversal occurs by pseudo-coherent rotation. With increasing diameter, magnetization reversal takes place via different nucleation （the transverse domain wall and the vortex domain wall） and subsequent propagation. The reason of transition from the transverse domain wall to the vortex domain wall is given by analytical studies. With further increase of the diameter, the reversal nuclear domain wall becomes tundishoshaped form. As the diameter increases, the width of wall becomes larger.The magnetization reversal mechanisms for Ni nanowires with different diameters were investigated by micromagnetic simulations. The results show that the reversal mechanisms are significantly dependeht on the diameter of wire. For very thin wires, the reversal occurs by pseudo-coherent rotation. With increasing diameter, magnetization reversal takes place via different nucleation （the transverse domain wall and the vortex domain wall） and subsequent propagation. The reason of transition from the transverse domain wall to the vortex domain wall is given by analytical studies. With further increase of the diameter, the reversal nuclear domain wall becomes tundishoshaped form. As the diameter increases, the width of wall becomes larger.

关 键 词：NANOWIRE MICROMAGNETICS Magnetization reversal mechanism 

分 类 号：O157.5[理学—数学] TM912[理学—基础数学]