Nonadiabatic spin-torque and damping effects on vortex core switching triggered by a single current pulse  

作　　者：金伟 刘要稳 

机构地区：[1]Department of Physics and Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University [2]College of Physics and Communication Electronics,Anhui Normal University

出　　处：《Chinese Physics B》2010年第3期421-425,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 50871075 and 10974142);the Natural Science Foundation of Shanghai,China (Grant No. 08ZR1420500)

摘　　要：Switching the orientation of a vortex core by spin-polarised pulse current introduces a promising concept for the reliable addressing of a single nanodisc element inside dense arrays. In this paper, micromagnetic simulations are employed to study the vortex core switching behaviour excited by a short in-plane Gaussian current pulse. We find that both the switching mechanism and the switching time are not sensitive to changes in the phenomenological parameters of spin-torque nonadiabaticity and Gilbert damping. The switching time, however, strongly depends on the current strength. In addition, we have theoretically predicted the parameter range of current pulses to achieve a single switching event.Switching the orientation of a vortex core by spin-polarised pulse current introduces a promising concept for the reliable addressing of a single nanodisc element inside dense arrays. In this paper, micromagnetic simulations are employed to study the vortex core switching behaviour excited by a short in-plane Gaussian current pulse. We find that both the switching mechanism and the switching time are not sensitive to changes in the phenomenological parameters of spin-torque nonadiabaticity and Gilbert damping. The switching time, however, strongly depends on the current strength. In addition, we have theoretically predicted the parameter range of current pulses to achieve a single switching event.

关 键 词：magnetic vortex spin torque micromagnetic simulation 

分 类 号：O482.5[理学—固体物理]