Optimisation of soft layer uniaxial anisotropy gradient in media for microwave-assisted magnetic recording

Simon John Greaves, Ryo Itagaki, Yasushi Kanai

Research output: Contribution to journalArticlepeer-review

Abstract

Exchange coupled composite (ECC), notched, and graded anisotropy recording media were optimised for microwave-assisted magnetic recording at head-medium spacings from 4.5 nm to 14.5 nm. When the average value of uniaxial anisotropy (Ku) in the soft layer was low notched media gave the best recording performance. As the average soft layer Ku increased, first ECC, and then graded anisotropy media became optimal. When the hard layer Ku was high notched media outperformed graded anisotropy media. However, the performance of graded anisotropy media improved as the hard layer Ku was reduced, and when the hard layer Ku was sufficiently small graded anisotropy media were preferred.

Original languageEnglish
JournalIEEE Transactions on Magnetics
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Anisotropic magnetoresistance
  • ECC
  • graded
  • Magnetic heads
  • Magnetization
  • Media
  • media optimisation
  • microwave assisted magnetic recording
  • notched
  • Saturation magnetization
  • Signal to noise ratio
  • Switches

ASJC Scopus subject areas

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

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