Effects of utilizing a granular nucleation layer on magnetic properties and microstructure of CoPt–B2O3 granular medium

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

Research output: Contribution to journalArticle

Abstract

The magnetic properties and microstructure of Co80Pt20–30 vol % B2O3 granular medium deposited on nucleation layers (NLs) with Co80Pt20–30 vol % oxides (oxides: Nb2O5, WO3, Ta2O5, SiO2, TiO2, Al2O3, Cr2O3, and ZrO2) of various thicknesses were investigated. By introducing an NL, a granular medium with columnar growth of small magnetic grains can be obtained. Furthermore, magnetic grains are separated with an oxide grain boundary material from the initial growth region that promotes the decoupling of magnetic grains, which corresponds to an increase in coercivity. The degrees of diameter reduction and decoupling of magnetic grains depend on the NL thickness and the melting point of the oxide utilized in the NL.

Original languageEnglish
Article number09TE01
JournalJapanese journal of applied physics
Volume57
Issue number9
DOIs
Publication statusPublished - 2018 Sep

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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