Abstract
AbstractThe Mössbauer studies of the magnetic structure of nickel ferrite (NiFe_2O_4) nanoparticles (NPs) are presented. It is shown that the redistribution of ions over nonequivalent crystallographic positions occurs upon a decrease in the size of NiFe_2O_4 crystallites to nanovalues, thus leading to the structural transformation of NiFe_2O_4 nanoparticles from inverse spinel to mixed spinel. It has been established that the magnetic moments of Fe ions in the volume of NiFe_2O_4 nanoparticles are ferromagnetically (collinearly) ordered, being noncollinear (or oblique) in the near-surface layer probably due to the frustration of moments in the near-surface layer of nanoparticles.
Keywords
Spinel
Materials science
Crystallite
Redistribution (election)
Nanoparticle
Magnetic moment
Mössbauer spectroscopy
Crystallography
Nickel
Ion
Condensed matter physics
Nanotechnology
Chemistry
Metallurgy
Subject Areas
Magnetic Properties and Synthesis of Ferrites
·Materials Chemistry ·Physical Sciences
Iron oxide chemistry and applications
·Renewable Energy, Sustainability and the Environment ·Physical Sciences
Electromagnetic wave absorption materials
·Electronic, Optical and Magnetic Materials ·Physical Sciences
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