Study on high-frequency 3-D magnetization precession modes of circular magnetic nano-dots using coplanar wave guide vector network analyzer ferromagnetic resonance

Kousaku Miyake, Seung Mo Noh, Tomoaki Kaneko, Hiroshi Imamura, Masashi Sahashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Ferromagnetic resonance (FMR) modes for Fe 70Co 30 magnetic nano-dots of 100 nm in diameter in a mono-domain state are studied under different in-plane and out-of-plane magnetic fields using a reflection measurement from a vector network analyzer with a coplanar wave guide (CPW VNA FMR) and a micromagnetics simulation. The observed real and imaginary parts of the reflection signal become a combination of symmetric and antisymmetric Lorentzian forms in FMR. The combinations are given different susceptibility components of χ xx and χ zx by changing the sample position on the CPW. The magnetic dots exhibit triple modes in FMR spectra from an influence of the demagnetization field distribution in the mono-domain state. The magnetic dots also show a different variation of FMR amplitude in χ xx and χ zx for an out-of-plane field increase.

Original languageEnglish
Article number6187790
Pages (from-to)1782-1788
Number of pages7
JournalIEEE Transactions on Magnetics
Volume48
Issue number5 PART 1
DOIs
Publication statusPublished - 2012 May

Keywords

  • Ferromagnetic resonance
  • magnetic nano-dots
  • micromagnetics simulation
  • microwave assisted magnetic recording

ASJC Scopus subject areas

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

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