中国物理B ›› 2010, Vol. 19 ›› Issue (3): 37001-037001.doi: 10.1088/1674-1056/19/3/037001

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

刘要稳1, 金伟2   

  1. (1)Department of Physics and Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, China; (2)Department of Physics and Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, China;College of Physics and Communication Electronics, Anhui Normal University, Wuhu 241000, China
  • 收稿日期:2009-08-20 修回日期:2009-09-11 出版日期:2010-03-15 发布日期:2010-03-15
  • 基金资助:
    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).

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)†   

  1. 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
  • Received:2009-08-20 Revised:2009-09-11 Online:2010-03-15 Published:2010-03-15
  • Supported by:
    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).

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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.

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.

Key words: magnetic vortex, spin torque, micromagnetic simulation

中图分类号:  (Magnetization curves, hysteresis, Barkhausen and related effects)

  • 75.60.Ej
75.50.Bb (Fe and its alloys) 75.10.-b (General theory and models of magnetic ordering)