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Title: The role of interfacial metal silicates on the magnetism in FeCo/SiO2 and Fe49%Co49%V2%/SiO2 core/shell nanoparticles

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4915482· OSTI ID:1392361
 [1];  [2];  [3];  [4]
  1. Univ. of Manitoba, Winnipeg (Canada); Toyota Research Inst. of North America, Ann Arbor, MI (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Toyota Research Inst. of North America, Ann Arbor, MI (United States)
  4. Univ. of Manitoba, Winnipeg (Canada)
+ Show Author Affiliations

Herein we have investigated the role of spontaneously formed interfacial metal silicates on the magnetism of FeCo/SiO2 and Fe49%Co49%V2%/SiO2 core/shell nanoparticles. Element specific x-ray absorption and photoelectron spectroscopy experiments have identified the characteristic spectral features of metallic iron and cobalt from within the nanoparticle core. In addition, metal silicates of iron, cobalt, and vanadium were found to have formed spontaneously at the interface between the nanoparticle core and silica shell. X-ray magnetic circular dichroism experiments indicated that the elemental magnetism was a result of metallic iron and cobalt with small components from the iron, cobalt, and vanadium silicates. Magnetometry experiments have shown that there was no exchange bias loop shift in the FeCo nanoparticles; however, exchange bias from antiferromagnetic vanadium oxide was measured in the V-doped nanoparticles. These results showed clearly that the interfacial metal silicates played a significant role in the magnetism of these core/shell nanoparticles, and that the vanadium percolated from the FeCo-cores into the SiO2-based interfacial shell.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE; Natural Sciences and Engineering Research Council of Canada (NSERC)
Contributing Organization:
Natural Sciences and Engineering Research Council (NSERC) (Canada)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1392361
Journal Information:
Journal of Applied Physics, Vol. 117, Issue 17; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

References (9)

Synthesis and Covalent Surface Functionalization of Nonoxidic Iron Core−Shell Nanomagnets journal July 2009
Exchange-coupled nanocomposite magnets by nanoparticle self-assembly journal November 2002
Controlled growth of monodisperse silica spheres in the micron size range journal January 1968
Absolute helicity-dependent photoabsorption cross sections of Fe thin films and quantitative evaluation of magnetic-moment determination journal March 1998
Properties of high-density magnetic composite fabricated from iron powder coated with a new type phosphate insulator journal October 2005
Interactions of CO2 and CO at fractional atmosphere pressures with iron and iron oxide surfaces: one possible mechanism for surface contamination? journal January 2002
Electron-yield saturation effects in L -edge x-ray magnetic circular dichroism spectra of Fe, Co, and Ni journal March 1999
Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO 2 Core/Shell Nanoparticles journal February 2015
Increased surface spin stability in γ-Fe 2 O 3 nanoparticles with a Cu shell journal March 2012

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