Magnetic Properties and Columnar Structure for CoPt Alloy Granular Media with Grain Boundary Oxides of Various Melting Points

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

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Investigation of the effect of the melting point (Tm) of various single oxides on the columnar growth and generation of the nucleation site for CoPt granular media deposited at room temperature were conducted. When oxide with Tm from 1857 °C to 2410 °C is added to the granular media, thickness of the heteroepitaxial growth of the magnetic grains on the Ru underlayer (columnar structure) decreases from 13 to 5.5 nm. The employment of oxide with Tm of the range from 450 °C to 2410 °C to the granular media will lead to the reduction of grain size from 5.6 to 3.0 nm, due to the suppression of the lateral grain growth by the high Tm oxide.

Original languageEnglish
Article number7932517
JournalIEEE Transactions on Magnetics
Volume53
Issue number11
DOIs
Publication statusPublished - 2017 Nov

Keywords

  • CoPt oxide granular media
  • high Ku
  • oxide melting point
  • small magnetic grain size

ASJC Scopus subject areas

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

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