Structure and composition of Au/Co magneto-plasmonic nanoparticles

Bhattarai, Nabraj y Casillas, Gilberto y Khanal, Subarna y Bahena, Daniel y Velázquez Salazar, J. Jesús y Mejía Rosales, Sergio y Ponce, Arturo y Dravid, Vinayak y Whetten, Robert L. y Mariscal, Marcelo M. y Yacamán, Miguel José (2013) Structure and composition of Au/Co magneto-plasmonic nanoparticles. MRS Communications, 3 (3). pp. 177-183. ISSN 2159-6859

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Resumen

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 inhomo- geneous alloying with minor segregation. The magnetic measurements obtained from superconducting quantum interference device magnet- ometer 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.

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