Manganese ferrite nanoparticles with different concentrations: Preparation and magnetism

doi:10.1016/j.jmst.2017.04.002

Abstract

Abstract:

MnFe₂O₄ nanoparticles were synthesized by thermal decomposition of a metal-organic salt in organic solvent with a high boiling point. Some nanoparticles exhibited the triangular shape which has not been observed before as far as we know, while some nanoparticles formed the aggregates with different sizes and shapes. The strength of interparticle dipolar interaction was changed by diluting MnFe₂O₄ nanoparticles in the SiO₂ matrix with different concentrations. The strong dipolar interaction has been suggested to enhance the blocking temperature (T_B) and suppress the remanence (M_r) to saturation (M_s) magnetization ratio (M_r/M_s) for the spherical-like cobalt ferrite nanoparticles in many previous reports. However, M_r/M_s and T_B of MnFe₂O₄ nanoparticles reported herein mainly depend on the size and shape of the nanoparticles and their aggregates.

Key words: Nanostructure, Magnetic materials, Magnetic properties, Chemical synthesis, Electronic structure

Zheng Chen, Xiao Sun, Zongling Ding, Yongqing Ma. Manganese ferrite nanoparticles with different concentrations: Preparation and magnetism[J]. J. Mater. Sci. Technol., 2018, 34(5): 842-847.

Figures/Tables 7

Fig. 1. TEM image and the magnified plot of triangular MnFe2O4 nanoparticles (inset) (a); TEM image of the aggregates consisting of several particles (b); size histogram with the Gaussian fitting curve (solid line) (c); HRTEM image and the magnified detail (inset) of the square-marked area (d); TEM images of MFOM (e) and MFOL (f).

Fig. 2. XRD patterns of MFOM (a) and MFOL (b); the standard PDF card of MnFe2O4 (No. 73-1964) (c).

Fig. 3. M(H) loops measured at different temperatures for the MFOM sample. The inset shows the magnified loop in the low field region.

Fig. 4. M(H) loops measured at different temperatures for the MFOL sample. The inset shows the magnified loop in the low field region.

Fig. 5. FC (solid circles) and ZFC (empty circles) magnetization curves for MFOM (a) and MFOL (b) samples at an applied magnetic field of H = 200 Oe. The insets show the detail of FC magnetization; Ms versus temperature for the MFOM and MFOL samples (c); Coercivity Hc versus square root temperature for the MFOM (solid circles) and MFOL (empty circles) samples where the solid line is the fit to the experimental data points according to Kneller’s law (d).

Fig. 6. Temperature dependence of K (a), Dm (b), Hdip (c) and Mr/Ms (d) for the MFOM and MFOL samples.

Fig. 7. Temperature dependence of K and Mr/Ms for the MFOH sample.

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