Effect of asymmetric shape on vortex control in permalloy rings

Chia Jung Hsu, Chao Hsien Huang, Wei Kang Lin, Li Hao Chan, Tian Chiuan Wu, Jong-Ching Wu, Lance Horng

研究成果: Article

1 引文 (Scopus)

摘要

A method to control the vortex state (flux-closure state) nucleation and annihilation field in asymmetric permalloy (Py) rings is presented. By introducing an inner circle shifted from the center of outer circle by a shift length, samples of asymmetric permalloy rings with different asymmetric ratios were fabricated by using E-beam lithography, sputtering, lift-off techniques, and measured by focused magneto-optic Kerr effect magnetometry. The vortex nucleation (Hn) and vortex annihilation (Han) fields, analyzed from the simulated and experimental hysteresis loops of 500 nm and 1000 nm outer diameters, have linear relations to the asymmetric ratio. When the lateral size reduces down to nanosize, two switching behaviors for the simulated hysteresis loops were observed. The single switching loop indicates that the switching process is single-domain switching and the all the spins rotate coherently. The double switching loop corresponds to the switching process via the formation of a vortex state. Both analyzed switching fields from the experiment and simulation present a linear relation with the aspect ratio in the small range of variation. This relation indicates that the Hn and Han of asymmetric ring arrays are mainly controlled by the shape anisotropy. It is observed that the switching behavior is in agreement with the experimental results.

原文English
文章編號2274726
期刊IEEE Transactions on Magnetics
50
發行號1
DOIs
出版狀態Published - 2014 一月 1

指紋

Vortex flow
Hysteresis loops
Nucleation
Magnetooptical effects
Lithography
Sputtering
Aspect ratio
Anisotropy
Fluxes
Experiments

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

引用此文

Hsu, Chia Jung ; Huang, Chao Hsien ; Lin, Wei Kang ; Chan, Li Hao ; Wu, Tian Chiuan ; Wu, Jong-Ching ; Horng, Lance. / Effect of asymmetric shape on vortex control in permalloy rings. 於: IEEE Transactions on Magnetics. 2014 ; 卷 50, 編號 1.
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Effect of asymmetric shape on vortex control in permalloy rings. / Hsu, Chia Jung; Huang, Chao Hsien; Lin, Wei Kang; Chan, Li Hao; Wu, Tian Chiuan; Wu, Jong-Ching; Horng, Lance.

於: IEEE Transactions on Magnetics, 卷 50, 編號 1, 2274726, 01.01.2014.

研究成果: Article

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