Promotion of self-assembly patterning of fept nanoparticles by tuning the concentration of oleylamine/oleic acid surfactants in a coating solution

Yoshiki Fujihira, Takuma Hachisu, Suguru Shitanda, Kenichiro Aikawa, Atsushi Sugiyama, Jun Mizuno, Shuichi Shoji, Toru Asahi, Tetsuya Osaka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

To provide a bit-patterned perpendicular magnetic recording medium consisting of an array of FePt magnetic nanoparticles, the effect of the total dispersant concentrations of oleylamine and oleic acid in a FePt-nanoparticle/toluene coating solution on a self-assembled nanoparticle array with a long-range periodicity on a flat SiO2/Si substrate and two patterned substrates, respectively, was examined. At a surfactant concentration greater than 0.8 vol%, FePt nanoparticles with an average size of 4.4 nm were arrayed in a two-dimensional and hexagonal-close-packed ordered array with 8.3-nm pitches on the flat surface. Self-assembled nanoparticles were arrayed on the bottom surface of the patterned trench, the array exhibited a hexagonal-close-packed structure. Furthermore the line defects in the arrays are caused by the waviness of the trench walls, and the surface roughness.

Original languageEnglish
Pages (from-to)D171-D174
JournalJournal of the Electrochemical Society
Volume163
Issue number5
DOIs
Publication statusPublished - 2016 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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