Journal
PHYSICAL REVIEW MATERIALS
Volume 4, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.4.034408
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Funding
- DOE Office of Science [DE-AC02-06CH11357]
- National Institute of Standards and Technology [DMR-1508249]
- National Science Foundation [DMR-1508249]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-07ER46438]
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We have used a combination of x-ray magnetic circular dichroism (XMCD) spectroscopy and polarized small-angle neutron scattering (P-SANS) to investigate the distribution of magnetization in heterogenous magnetic nanoparticles (NPs) consisting of a metallic Fe core/Fe oxide shell (CS NPS) or Fe core/partial void layer/oxide shell (CVS NPs). Fe L-2,L-3 XMCD spectra were analyzed with a combination of experimental metallic Fe XMCD spectra and calculated L-edge spectra for the Fe cations in the oxide shell. Analyses of the temperature-dependent spectra indicate a weak variation of the relative contribution of the metallic and oxide contributions for the CS NPs, and a somewhat larger contribution from the metallic Fe core near the blocking temperature T-B of the CVS NP ensemble. The P-SANS data also indicate a larger variation in the magnetization of the CVS NPs near T-B. Modeling of the spin-dependent neutron scattering reveals large variations in the radial magnetization distribution, with a region of reversed magnetization adjacent to the metallic core. Interfacial roughness may play a role in the development of this magnetization profile.
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