Structural and magnetic properties of monolayer film of CoPt nanoparticles synthesized by polyol process

M. Mizuno, Y. Sasaki, M. Inoue, C. N. Chinnasamy, B. Jeyadevan, D. Hasegawa, T. Ogawa, M. Takahashi, K. Tohji, K. Sato, S. Hisano

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23 Citations (Scopus)

Abstract

Co43 Pt57 nanoparticle dispersion was synthesized by using the polyol process, and monolayer film of the particles with [3-(2-aminoethylamino)propyl]trimethoxysilane coupling layer on a silicon substrate was fabricated and characterized. After the film was annealed at 873 K, the Co43 Pt57 nanoparticles transformed from their as-deposited fcc phase to L 10 structure. However, the resulting ca ratio was only 0.993, indicating incomplete transformation. Grain size of the annealed film was 4.9 nm against 4.1 nm for the as-deposited state. The annealed film showed the presence of high anisotropic phase with the remanence coercivity of 4.2 kOe and anisotropy field over 25 kOe at RT.

Original languageEnglish
Article number10J301
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
Publication statusPublished - 2005 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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