Spin dynamics in ferromagnetic resonance for nano-sized magnetic dot arrays: Metrology and insight into magnetization dynamics

Seungmo Noh, Daisuke Monma, Kousaku Miyake, Masaaki Doi, Tomoaki Kaneko, Hiroshi Imamura, Masashi Sahashi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The ferromagnetic resonance response (FMR) in the variously sized magnetic dot arrays was measured by using network-analyzer ferromagnetic resonance technique. We first demonstrated that the magnetization excitation related to the susceptibility χzx by the coplanar wave-guide (CPW). In this χzx, the edge mode excitation modified the FMR response appreciably and found that the damping constant is strongly affected by the size of the nano-magnet. In larger nano-magnets, two edge modes were observed. We showed that this edge mode can be exploited as a means to separately characterize the magnetization state of the nano-magnet as well as the size variation. In addition, the simulation results are also presented here to account for the experimental observations.

Original languageEnglish
Article number6027760
Pages (from-to)2387-2390
Number of pages4
JournalIEEE Transactions on Magnetics
Volume47
Issue number10
DOIs
Publication statusPublished - 2011 Oct 1

Keywords

  • Coplanar waveguide (CPW)
  • damping constant
  • magnetic dot array
  • magnetization dynamics
  • network analyzer ferromagnetic resonance (NA-FMR)
  • rf magnetic susceptibility

ASJC Scopus subject areas

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

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