Relationship between applied field gradient and magnetization switching in ECC structured dots

Yuta Ikeda, Simon Greaves, Hajime Aoi, Hiroaki Muraoka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The dependence of the switching of magnetic dots with a composite structure on applied field gradients is investigated. The dot size and magnetic properties were targeted at 2 Tbit/in2 -class bit patterned media. In the case of a head field with only a perpendicular component, the switching probability can be considered to be the fraction of the dot volume in which the field exceeds the average switching field of the dot when measured in a globally uniform field. The switching probability also depends on the recording field gradient within the dot. On the other hand, in the case of a vector recording field with in-plane components, the switching probability can be approximated by considering the angular dependence of switching field, calculated in a globally uniform field. Additionally, down-track write margins are estimated and found to increase logarithmically as the gradient is increased.

Original languageEnglish
Article number5467631
Pages (from-to)1622-1625
Number of pages4
JournalIEEE Transactions on Magnetics
Volume46
Issue number6
DOIs
Publication statusPublished - 2010 Jun 1

Keywords

  • Bit-patterened media (BPM)
  • Exchange coupled composite (ECC) media
  • Gradient
  • Magnetization switching

ASJC Scopus subject areas

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

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