Micromagnetic Simulation of Microwave-Assisted Magnetization Switching Process for Granular Films

Terumitsu Tanaka, Yukio Nozaki, Kimihide Matsuyama

Research output: Contribution to journalArticle

Abstract

Microwave-assisted magnetization switching (MAS) processes for granular films were demonstrated by time integration of the Landau-Lifshitz-Gilbert equation. At low microwave frequencies, hysteresis loops become narrower, and at higher frequencies, an extra step occurs in the curves. In the case when the extra step occurs, saturation field increases to be comparable to that for non-MAS case, although switching field decreases. The occurrence of the extra step possibly originates from 'unstable switching process' predicted by Bertotti et al., and the magnetization contour maps indicated large un-switched agglomerates remains when MAS proceeds through the unstable switching process. The unstable switching processes are also observed even when dc incident angles are large.

Original languageEnglish
Article number7908999
JournalIEEE Transactions on Magnetics
Volume53
Issue number11
DOIs
Publication statusPublished - 2017 Nov 1

Keywords

  • Granular film
  • micromagnetic simulation
  • microwave-assisted magnetization switching (MAS)

ASJC Scopus subject areas

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

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