Akademik Veri Yönetim Sistemi
6th International Conference on Materials Science and Nanotechnology For Next Generation (MSNG-2019) October 16-18, 2019, Niğde, TURKEY, Niğde, Türkiye, 16 - 18 Ekim 2019, ss.1
Magnetite Fe3O4 magnetic nanoparticles
(MNPs) having ferrimagnetic (FIM) characteristic are one of the important
materials between FexOy groups due to having a high
saturation magnetization (Ms)
and nearly full spin polarization at 300 K. Therefore, it has attracted
attention to use in giant magneto-electronic and spin-valve devices [1]. In
this study, we synthesized both Fe3O4 MNPs and ZrO2-Coated
Fe3O4 core/shell MNPs via polyol reduction process. The
structural properties were studied by X-Ray Diffraction (XRD) method. The
average crystallite size of Fe3O4/ZrO2 core/shell
MNPs was calculated as ~6.3 nm. The morphological and elemental properties were
characterized by the Scanning Electron Microscopy (SEM) and the Energy
Dispersive Spectroscopy (EDS) analysis. The average particle size was
determined as ~3.4 nm from SEM images. The temperature dependence magnetization
(M-T) under Zero Field Cooled (ZFC)
and Field (FC) conditions and the magnetic field dependence magnetization (M-H) measurements (under 10 and 300 K)
were carried out by the Physical Property Measurement System (PPMS) with
Vibrating Sample Module (VSM) analysis. From the M-T measurements, it was observed that ferromagnetic to
paramagnetic phase transition and the blocking temperature (TB) were determined as 50 and
25 K, respectively. The Ms
was determined as ~48.92 and 47.29 emu/g at 20 and 100 K, respectively. The
effect of ZrO2 coating on Fe3O4 will be
discussed in detail in the presentation.
[1] G. F. Goya, T. S. Berquo and F. C. Fonseca, Static and Dynamic Magnetic Properties of Spherical Magnetite Nanoparticles, Journal of Applied Physics, 94, 5, (2003).