Microwave-Assisted Magnetization Reversal in Exchange-Coupled Composite Media Using Linearly Polarized Microwave Fields

Yukio Nozaki, Shinya Kasai

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have experimentally demonstrated a microwave-assisted magnetization reversal (MAMR) in exchange-coupled composite (ECC) media using the linearly polarized microwave fields generated by an electrically shorted coplanar waveguide. The MAMR frequency exhibiting a maximum reduction of coercive field can be decreased using 16 nm-thick ECC media without the suppression of the thermal stability of magnetization. The threshold amplitude of microwave field required for the successful MAMR is only 3% of the anisotropy field of the medium. A splitting of ferromagnetic resonance spectrum, which suggests an appearance of stochastic MAMR, can be observed after applying microwave fields. The stochastic MAMR gives rise to the threshold behavior in the condition of microwave field amplitude needed for MAMR.

Original languageEnglish
Article number7265063
JournalIEEE Transactions on Magnetics
Volume52
Issue number2
DOIs
Publication statusPublished - 2016 Feb 1

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Keywords

  • Exchange-coupled composite (ECC)
  • ferromagnetic resonance (FMR)
  • magnetic recording
  • microwave-assisted magnetization reversal (MAMR)
  • perpendicular granular medium

ASJC Scopus subject areas

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

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