Reduction of intergranular exchange coupling for CoPt-B2O3 granular media by employing a rucocr-oxide buffer layer with oxide of various melting points

Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, Shin Saito

Research output: Contribution to journalArticlepeer-review

Abstract

Investigation of magnetic properties and microstructure for the Co80Pt20-30vol% B2O3 granular medium deposited on Ru50Co25Cr25-30vol% oxide buffer layer (BL) with oxide of various melting points was conducted. It was found that by employing a BL, coercivity of the granular medium is enhanced due to the promotion of intergranular exchange decoupling. Thickness of the BL to obtain the maximum coercivity can be reduced when oxides with high melting point is utilized. Significant reduction of grain diameter (GD) of the granular medium is obtained when a thick BL with high-melting point oxide is applied. For a typical Ru50Co25Cr25-30vol% TiO2 BL of 2 nm, a granular medium with high coercivity, anisotropy field, and small magnetic GD of 9.4, 19.5 kOe, and 5.6 nm, respectively, can be achieved.

Original languageEnglish
Article number8379351
JournalIEEE Transactions on Magnetics
Volume54
Issue number11
DOIs
Publication statusPublished - 2018 Nov 1

Keywords

  • CoPt-BO granular media
  • RuCoCr-oxide buffer layer (BL)
  • intergranular exchange coupling
  • oxide melting point

ASJC Scopus subject areas

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

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