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Chin. Phys. B, 2010, Vol. 19(3): 037001    DOI: 10.1088/1674-1056/19/3/037001

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

Jin Wei(金伟)a)b) and Liu Yao-Wen(刘要稳)a)†
a Department of Physics and Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, China; b College of Physics and Communication Electronics, Anhui Normal University, Wuhu 241000, China
Abstract  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.
Keywords:  magnetic vortex      spin torque      micromagnetic simulation  
Received:  20 August 2009      Revised:  11 September 2009      Accepted manuscript online: 
PACS:  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  75.50.Bb (Fe and its alloys)  
  75.10.-b (General theory and models of magnetic ordering)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.~50871075 and 10974142) and the Natural Science Foundation of Shanghai, China (Grant No.~08ZR1420500).

Cite this article: 

Jin Wei(金伟) and Liu Yao-Wen(刘要稳) Nonadiabatic spin-torque and damping effects on vortex core switching triggered by a single current pulse 2010 Chin. Phys. B 19 037001

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