Effect of ZnO on Structural and Magnetic Properties of MnFe2O4/ZnO Nanocomposite

Abstract

In this paper, we reported a comparative study of structural and magnetic properties of MnFe 2 O 4 /ZnO nanocomposite and MnFe 2 O 4 nanoparticles. The samples were prepared with a simple thermal decomposition method and then were characterized through thermogravimetry (TG) and differential thermal analysis (DTA), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) images, and vibrating sample magnetometry (VSM) at different temperatures. TG curves showed that pure samples can be obtained at 400 • C. XRD pattern of composite sample confirmed coexistence of crystalline cubic spinel Mn-ferrite and hexagonal zinc oxide phases. The estimated lattice parameter of MnFe 2 O 4 nanoparticles, a = 8.39Å, was smaller than bulk value (a = 8.51Å) due to finite size effects. The magnetization of both samples followed the Bloch law with almost the same Bloch constant of β ∼ 5 × 10 −5 (K −3/2 ) showing similar spin wave excitation mechanisms in the samples. However, the VSM measurements indicated that increase of coercivity (H c ) of composite sample with decreasing the temperature is faster when compared with pure ferrite.

Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe2O4/NiO nanocomposites

“…The observed minor lattice contraction of ZnFe 2 O 4 NPs can be attributed to increased surface stresses with the increment of NiO in the nanocomposites. Similar results were obtained for MnFe 2 O 4 /ZnO NCs [36] and GO/ZnFe 2 O 4 /NiO NCs [37].…”

Structure and magnetic properties of Zr–Mn substituted strontium hexaferrite Sr(Zr,Mn) x Fe12−2x O19 nanoparticles synthesized by sol–gel auto-combustion method

“…The observed band at around 435 cm −1 is corresponded to asymmetric vibration frequency of Sr-O bond [22]. Also the band at about 560 cm −1 is attributed to the tetrahedral metal-oxygen (M-O) sub-lattices of the MnFe 2 O 4 [23]. The vibration bands are due to the Zr and Sr bonds with oxygen atoms expected to exhibit similar energies and bands near each other at approximately 600 cm −1 in the spectrum.…”

Magnetically Separable ZnO-MnFe2O4 Nanocomposites Synthesized in organic-free Media for dye Degradation Under Natural Sunlight

“…Manganese ferrites are widely used in many areas such as high-density magnetic recording, ferrofluid technology, electronic devices, magnetic resonance imaging (MRI), microwave adsorption, biomedical drug delivery, catalysis and environmental analysis [13][14][15] . Besides that, this ferrite has moderate saturation magnetization at 300 K (Ms about 83 emu/g) and low Curie temperature (Tc about 580 K) 16 in all formulations could be used to completely degrade the dye under sunlight irradiation and the sample could be separated from the liquid by external magnetic field and used for the subsequence photocatalytic process.…”