Preparation of monodisperse and highly coercive L10-FePt nanoparticles dispersible in nonpolar organic solvents

Shinpei Yamamoto, Yasumasa Morimoto, Yoshinori Tamada, Y. K. Takahashi, K. Hono, Teruo Ono, Mikio Takano

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

A method to prepare monodisperse and highly coercive L10-FePt nanoparticles that are dispersible in nonpolar organic solvents such as toluene, chloroform, and hexane was developed. By vigorously stirring the SiO 2-coated L10-FePt nanoparticles synthesized by the "SiO2-nanoreactor" method (Appl. Phys. Lett. 2005, 87, 032503) in a mixture of an aqueous NaOH solution, chloroform, and hexadecyltrimethlyammonium bromide, the SiO2 coating was dissolved off, and bare FePt nanoparticles could be extracted to the chloroform phase without degrading their magnetic properties. These particles showed a tendency to form a close-packed lattice on slow drying of the chloroform-based solution. The present success may promote the practical application to ultra-high-density magnetic recording and also may open the door to providing these particles with new physical and/or chemical functions.

Original languageEnglish
Pages (from-to)5385-5388
Number of pages4
JournalChemistry of Materials
Volume18
Issue number22
DOIs
Publication statusPublished - 2006 Oct 31
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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