Radio Frequency Field Dependence of Microwave-Assisted Switching Behaviors of Co/Pt Nanodots

Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

Research output: Contribution to journalArticle

Abstract

Microwave-assisted magnetization switching (MAS) has been expected as one of the prominent future ultra-high-density magnetic recording technologies. In this paper, we have studied the radio frequency (RF) field dependence of the switching behavior of Co/Pt nanodot arrays with various dot diameters. While the critical frequency increases and the minimum switching field decreases with increasing the RF field, MAS behavior critically depends on the dot size. For small dots less than 130 nm in diameter, the critical frequency and the minimum switching field exhibit linear variation with the RF field. On the other hand, for the larger dots (dot diameter ≥ 230 nm), they exhibit not only profound MAS effect but also obvious change in the behavior at a certain RF field. These changes of MAS behaviors are explained as a consequence of the change of magnetization precession mode. On the other hand, the dispersions of MAS effect exhibit no remarkable variation on the RF field.

Original languageEnglish
Pages (from-to)79-85
Number of pages7
JournalElectronics and Communications in Japan
Volume99
Issue number8
DOIs
Publication statusPublished - 2016 Aug 1

Keywords

  • magnetization switching
  • microwave
  • nanodot
  • precessional motion

ASJC Scopus subject areas

  • Signal Processing
  • Physics and Astronomy(all)
  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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