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

doi:10.1557/mrc.2013.30

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

Research output: Contribution to journal › Article › peer-review

25 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 language	English (US)
Pages (from-to)	177-183
Number of pages	7
Journal	MRS Communications
Volume	3
Issue number	3
DOIs	https://doi.org/10.1557/mrc.2013.30
State	Published - 2013
Externally published	Yes

ASJC Scopus subject areas

General Materials Science

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title = "Structure and composition of Au/Co magneto-plasmonic nanoparticles",

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.",

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doi = "10.1557/mrc.2013.30",

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AU - Bhattarai, Nabraj

AU - Casillas, Gilberto

AU - Khanal, Subarna

AU - Bahena, Daniel

AU - Velazquez-Salazar, J. Jesus

AU - Mejia, Sergio

AU - Ponce, Arturo

AU - Dravid, Vinayak P.

AU - Whetten, Robert L.

AU - Mariscal, Marcelo M.

AU - Jose-Yacaman, Miguel

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

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ER -

Structure and composition of Au/Co magneto-plasmonic nanoparticles

Abstract

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