中国物理B ›› 2015, Vol. 24 ›› Issue (9): 97506-097506.doi: 10.1088/1674-1056/24/9/097506

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Nonmonotonic effects of perpendicular magnetic anisotropy on current-driven vortex wall motions in magnetic nanostripes

苏垣昌, 雷海洋, 胡经国   

  1. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
  • 收稿日期:2015-02-06 修回日期:2015-04-01 出版日期:2015-09-05 发布日期:2015-09-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11247026 and 11374253).

Nonmonotonic effects of perpendicular magnetic anisotropy on current-driven vortex wall motions in magnetic nanostripes

Su Yuan-Chang (苏垣昌), Lei Hai-Yang (雷海洋), Hu Jing-Guo (胡经国)   

  1. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
  • Received:2015-02-06 Revised:2015-04-01 Online:2015-09-05 Published:2015-09-05
  • Contact: Su Yuan-Chang, Hu Jing-Guo E-mail:ycsu@yzu.edu.cn;jghu@yzu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11247026 and 11374253).

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摘要： In a magnetic nanostripe, the effects of perpendicular magnetic anisotropy (PMA) on the current-driven horizontal motion of vortex wall along the stripe and the vertical motion of the vortex core are studied by micromagnetic simulations. The results show that the horizontal and vertical motion can generally be monotonously enhanced by PMA. However, when the current is small, a nonmonotonic phenomenon for the horizontal motion is found. Namely, the velocity of the horizontal motion firstly decreases and then increases with the increase of the PMA. We find that the reason for this is that the PMA can firstly increase and then decrease the confining force induced by the confining potential energy. In addition, the PMA always enhances the driving force induced by the current.

关键词: domain wall motion, current, perpendicular magnetic anisotropy, micromagnetic simulation

Abstract: In a magnetic nanostripe, the effects of perpendicular magnetic anisotropy (PMA) on the current-driven horizontal motion of vortex wall along the stripe and the vertical motion of the vortex core are studied by micromagnetic simulations. The results show that the horizontal and vertical motion can generally be monotonously enhanced by PMA. However, when the current is small, a nonmonotonic phenomenon for the horizontal motion is found. Namely, the velocity of the horizontal motion firstly decreases and then increases with the increase of the PMA. We find that the reason for this is that the PMA can firstly increase and then decrease the confining force induced by the confining potential energy. In addition, the PMA always enhances the driving force induced by the current.

Key words: domain wall motion, current, perpendicular magnetic anisotropy, micromagnetic simulation

中图分类号:  (Domain walls and domain structure)

  • 75.60.Ch
72.25.Pn (Current-driven spin pumping) 75.78.Cd (Micromagnetic simulations ?)