Structure and composition of Au/Co magneto-plasmonic nanoparticles

Nabraj Bhattarai, Gilberto Casillas, Subarna Khanal, Daniel Bahena, J. Jesus Velazquez-Salazar, Sergio Mejia, Arturo Ponce, Vinayak P. Dravid, Robert L. Whetten, Marcelo M. Mariscal, Miguel Jose-Yacaman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The fabrication of bimetallic magnetic nanoparticles (NPs) smaller than the size of single magnetic domain is very challenging because of the agglomeration, non-uniform size, and possible complex chemistry at nanoscale. In this paper, we present an alloyed ferromagnetic 4 ± 1 nm thiolated Au/Co magnetic NPs with decahedral and icosahedral shape. The NPs were characterized by Cs-corrected scanning transmission electron microscopy (STEM) and weretheoretically studied by Grand Canonical Monte Carlo simulations. Comparison of Z-contrast imaging and energy dispersive x-ray spectroscopy used jointly with STEM simulated images from theoretical models uniquely showed an inhomogeneous alloying with minor segregation. The magnetic measurements obtained from superconducting quantum interference device magnetometer exhibited ferromagnetic behavior. This magnetic nanoalloy in the range of single domain is fully magnetized and carries significance as a promising candidate for magnetic data recording, permanent magnetization, and biomedical applications.

Original languageEnglish (US)
Pages (from-to)177-183
Number of pages7
JournalMRS Communications
Volume3
Issue number3
DOIs
StatePublished - Jan 1 2013

ASJC Scopus subject areas

  • Materials Science(all)

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