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

doi:10.1088/1674-1056/24/9/097506

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.

Keywords: domain wall motion current perpendicular magnetic anisotropy micromagnetic simulation

Received: 06 February 2015
Revised: 01 April 2015
Accepted manuscript online:

PACS:	75.60.Ch	(Domain walls and domain structure)
	72.25.Pn	(Current-driven spin pumping)
	75.78.Cd	(Micromagnetic simulations ?)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11247026 and 11374253).

Corresponding Authors: Su Yuan-Chang, Hu Jing-Guo
E-mail: ycsu@yzu.edu.cn;jghu@yzu.edu.cn

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Su Yuan-Chang (苏垣昌), Lei Hai-Yang (雷海洋), Hu Jing-Guo (胡经国) Nonmonotonic effects of perpendicular magnetic anisotropy on current-driven vortex wall motions in magnetic nanostripes 2015 Chin. Phys. B 24 097506

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

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