Examination of the magnetism dynamics from intermixing effects in γ-Fe2O3/MnO core-shell nanoparticles

被引:2
作者
Skoropata, E. [1 ]
Su, T. T. [2 ]
Ouyang, H. [2 ]
Freeland, J. W. [3 ]
van Lierop, J. [1 ]
机构
[1] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada
[2] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu, Taiwan
[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
关键词
Compilation and indexing terms; Copyright 2025 Elsevier Inc;
D O I
10.1063/1.4915096
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have examined the effects of core-shell intermixing on the dynamical magnetism of gamma-Fe2O3/MnO nanoparticles. The core and shell phases were identified using x-ray diffraction, and x-ray absorption spectroscopy identified Mn ions in both octahedral and tetrahedral sites, consistent with a significant amount of substitution at the core-shell interface to form an Fe/Mn-ferrite. The dynamical response was probed by Mossbauer spectroscopy, which decouples surface and core spins, and suggested a change in the relaxation behaviour among the spin populations within gamma-Fe2O3/MnO relative to the gamma-Fe2O3 seed particles. Interestingly, the magnetic relaxation effects at the atomic scale, measured via Mossbauer spectroscopy, were enhanced, indicating that the addition of an MnO shell and intermixing affected the dynamical freezing process which altered the surface magnetism of the gamma-Fe2O3 core. Our results show that both the MnO shell and the interfacial intermixed layer are important in determining the core-shell nanoparticle magnetism. (C) 2015 AIP Publishing LLC.
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页数:4
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