Microwave-Assistance Effect on Magnetization Switching in Antiferromagnetically Coupled CoCrPt Granular Media

Y. Nakayama, Y. Kusanagi, Takehito Shimatsu, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We examined microwave-assisted switching properties of an antiferromagnetically coupled (AFC) granular perpendicular medium consisting of CoCrPt-TiO2(5)/Co(0.7)/Ru(0.9)/Co(0.7)/CoCrPt-TiO2(3) (in nanometers). In a saturation remanent state, the magnetization of the lower CoCrPt-TiO2 + Co layer switched its direction to form AFC with that of the upper layer because of a thin-film thickness. We assessed the microwave-assistance effect on magnetization switching from the remanent state to the saturation state of the thick upper layer using an anomalous Hall effect. The reduction of a switching field was most enhanced by the application of microwaves of 10 GHz frequency. The switching field reduction by microwave assistance for the AFC medium, obtained by compensating a thermal agitation effect, was estimated as 26%.

Original languageEnglish
Article number7352319
JournalIEEE Transactions on Magnetics
Volume52
Issue number7
DOIs
Publication statusPublished - 2016 Jul 1

Keywords

  • AFC granular media
  • CoCrPt-TiO
  • MAMR
  • Switching property

ASJC Scopus subject areas

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

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