Synthesis and magnetic properties of multifunctional CoPtAu nanoparticles

Ji Hyun Min, Jun Hua Wu, Ah Young Song, In Tak Jeon, Jae Seon Ju, Young Keun Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We present the synthesis and magnetic properties of multifunctional CoPtAu alloy nanoparticles of three compositions, Co0.33 Pt0.33 Au0.33, Co0.2 Pt0.2 Au0.6, and Co0.4 Pt0.4 Au0.2, by a modified polyol process. The x-ray diffraction and transmission electron microscopy analyses confirm the formation of the alloy nanostructure comprising Au-rich and Pt-rich nanophases, with a narrow distribution of particle sizes and provides the detailed structural arrangements. The magnetic study shows the composition dependence of the magnetic properties of the nanoparticles, from superparamagnetic for both Co0.33 Pt0.33 Au0.33 and Co0.4 Pt0.4 Au0.2 to soft ferromagnetic for Co0.2 Pt0.2 Au0.6.

Original languageEnglish
Article number07B527
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
Publication statusPublished - 2009

Bibliographical note

Funding Information:
This work was supported by the Korea Science and Engineering Foundation through the Pioneer Research Center Program (M10711160001-08M1116-00110), the Korea Research Foundation Grant (KRF-2004-005-D00057), and the Seoul R&BD Program (No. 10920). FIG. 1. XRD patterns of the CoPtAu nanoparticles with three compositions of (a) Co 0.33 Pt 0.33 Au 0.33 , (b) Co 0.2 Pt 0.2 Au 0.6 , and (c) Co 0.4 Pt 0.4 Au 0.2 , respectively. The curves are shifted for clarity and the line indicates the position of the (111) peak. FIG. 2. Deconvolution analysis of the (111) peak in the Co 0.33 Pt 0.33 Au 0.33 nanoparticles. The circles for the experimental data points, thin curves (red online) for the deconvoluted components and thick curve (black online) for their sum. FIG. 3. TEM analysis of the nanoparticles of the three nominal compositions: Morphology for Co 0.33 Pt 0.33 Au 0.33 (a), Co 0.4 Pt 0.4 Au 0.2 (b), and Co 0.2 Pt 0.2 Au 0.6 (c), and lattice image for Co 0.33 Pt 0.33 Au 0.33 (d), Co 0.4 Pt 0.4 Au 0.2 (e), and Co 0.2 Pt 0.2 Au 0.6 (f). FIG. 4. M - H hysteresis curves of the CoPtAu nanoparticles with three compositions of (a) Co 0.33 Pt 0.33 Au 0.33 , (b) Co 0.2 Pt 0.2 Au 0.6 , and (c) Co 0.4 Pt 0.4 Au 0.2 , respectively.

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Synthesis and magnetic properties of multifunctional CoPtAu nanoparticles'. Together they form a unique fingerprint.

Cite this