Injection of synthesized FePt nanoparticles in hole-patterns for bit patterned media

Takuma Hachisu, Wataru Sato, Shugo Ishizuka, Atsushi Sugiyama, Jun Mizuno, Tetsuya Osaka

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

FePt nanoparticles of uniform sizes, compositions, and crystal structures can be obtained by chemical synthesis. Additionally, the nanoparticles can be well dispersed by the adsorption of a surfactant on the nanoparticle surface. Previously, the immobilization of FePt nanoparticles on a thermal oxide Si substrate was carried out by chemical synthesis, utilizing the PtS bonding between the -SH functional group in (3-mercaptopropyl)trimethoxysilane, MPTMS and Pt in FePt nanoparticles. However, controlling FePt nanoparticle arrays by this synthesis method was very difficult. In the present study, we attempted to control the distortion of the arrangement of FePt nanoparticles using an MPTMS layer modified with a silane coupling reaction and a geometrical structure prepared by ultraviolet nanoimprint lithography (UV-NIL). In this study, the hole-patterns used for the geometrical structure on Si(1 0 0) were 200 nm wide, 40 nm deep, and had a 500 nm pitch. The 5.6 nm FePt nanoparticles were used to coat the hole-patterns by using a picoliter pipette. An XHR-SEM image clearly revealed that the FePt nanoparticles were successfully arranged as a single layer with an average pitch of 10.0 nm by PtS bonding in the hole-patterns on Si(1 0 0).

Original languageEnglish
Pages (from-to)303-308
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume324
Issue number3
DOIs
Publication statusPublished - 2012 Feb 1

Keywords

  • Bit patterned media
  • Chemical bonding
  • Geometrical structure
  • Synthesized FePt nanoparticle

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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