Abstract
Iron oxide nanoparticles with different phases (α-Fe2O3, γ-Fe2O3 and Fe3O4) are classified as the substantial transition metal oxides taking advantage of technological importance. The results of a Monte Carlo study of magnetic ordering in selectively spinel nanoparticles are discussed. The classical spin model with the Heisenberg-type interactions was used with superexchange interaction term. Different types of selective structures were studied in the framework of crystalline spinel structures with perfect or disordered surface and dilution of octahedral sublattice. The results are compared for various degrees of magnetic competition between first neighbor’s interactions in inverse or mixed spinel nanoparticles. The results permit us to explain the variation in saturation magnetization and give a better insight into the complex interplay between cationic distribution and magnetic disorder in ferrimagnetic nanoparticles.
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