Structure and composition of Au/Co magneto-plasmonic nanoparticles

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 magn...

Descripción completa

Detalles Bibliográficos
Autores principales: Bhattarai, Nabraj, Casillas, Gilberto, Khanal, Subarna, Bahena, Daniel, Velázquez Salazar, J. Jesús, Mejía Rosales, Sergio, Ponce, Arturo, Dravid, Vinayak, Whetten, Robert L., Mariscal, Marcelo M., Yacamán, Miguel José
Formato: Artículo
Lenguaje:inglés
Publicado: 2013
Materias:
Acceso en línea:http://eprints.uanl.mx/8912/1/Structure%20and%20composition%20of%20Au_Co%20magneto-plasmonic%20nanoparticles.pdf
Descripción
Sumario: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.