Significant Modulation of Vortex Resonance Spectra in a Square-Shape Ferromagnetic Dot

Shaojie Hu, Xiaomin Cui, Kang Wang, Satoshi Yakata, Takashi Kimura

Research output: Contribution to journalArticlepeer-review


The resonance property of a magnetic vortex contained within a micron-sized square Py dot was detected using an amplitude-modulated magnetic field excitation technique. We found a significant modulation of the resonant spectra as the external magnetic field changes. The Lorentzianlike spectrum changes from a peak to a dip via a transition of anti-Lorentzian-like spectra. By conducting the micromagnetic simulations, we confirmed that the transition behavior results from the unusual resistance change depending on the vortex core center position. Additionally, the power dependence of the anti-Lorentzian-like spectra revealed a fairly persistent coexistence of peak and dip. Thus, the tunable spectra suggest one way to develop an integratable radiofrequency microcircuits.

Original languageEnglish
Article number2295
Issue number13
Publication statusPublished - Jul 1 2022

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)


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