Vortex Annihilation Dependence of Chirality in Asymmetric Permalloy Dots

Kuo Ming Wu, Chao Hsien Huang, Deng Shiang Shiu, Yun Hong, Kao Fan Lai, Jong Ching Wu, Lance Horng

Research output: Contribution to journalArticlepeer-review


Geometric asymmetry effect on vortex annihilation was investigated in series of submicro-scaled permalloy dots. By introducing the one-side-flat asymmetric shape into circular magnetic disks, the original degenerate signals of vortex annihilation for different chirality are separated into two different trajectories, where the asymmetry level is quantified by an excised angle. The separation of annihilation field for clockwise and counterclockwise vortex shows as a function of the excised angle. The asymmetry influence on the separation of annihilation field is discussed from the view of disk aspect ratio and flat boundary effect. Comparison of experimental results with numerical simulations is also presented.

Original languageEnglish
Article number1950001
Issue number1
Publication statusPublished - 2019 Mar 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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