Polarized Raman spectra of NiFe2O4 (NFO) films of varying thickness and growth temperature are investigated and discussed. We find that the relaxed films obtained at higher temperatures on MgAl2O4 (MAO) substrate exhibit spectra identical to those of single crystals and provide strong indications for ordering of Ni2+ and Fe3+ at the octahedral sites. There is evidence for a certain degree of B-...

We present all-optical studies of spin dynamics in two classes ferrimagnets. Both sets experiments use table-top laser-based pump–probe techniques to examine the ultrafast and longer timescale excitations. visible/near infra-red time-resolved magneto-optical Kerr effect (tr-MOKE) follow a series metallic (FeCo)1−xGdx thin films with varying Gd content. Magnetic compensation occurs at concentrat...

Abstract Herein, NiFe 2 O 4 doped Cu was synthesized using a mixed-oxide method to investigate its potential for creating composites with high microwave shielding effectiveness. The compound 2−x x values of 0.1, 0.3 and 0.5, respectively. After sintering at 1250 °C h, single-phase Ni ferrite formed. To analyze the phase composition structure compound, X-ray diffraction, scanning electron micros...

The magnetic nanocomposites of ZnO/NiFe2O4 were synthesized using a hydrothermal method in organic solvent-free media for application as heterojunction photocatalyst. XRD measurements confirmed the formation required phases with no impurity observed. SEM and TEM analysis morphology shape composite being spherical square-like grain. properties composites measured vibrating sampler magnetometer (...

A synergetic effect of nanocatalyst and ultrasonic irradiation was examined for the synthesis 4H-chromenes from benzaldehyde, cyclohexanone, malononitrile. It observed this contributory improved reaction that used highly pure products in short times highest yields. The nanocomposite includes guanidine anchored on to magnetic NiFe2O4 nanoparticles were as active base sonication compounds. produc...

Ni3[Fe(CN)6]2 nano-cubic precursors were prepared by chemical coprecipitation at room temperature with nickel acetate and potassium ferricyanide as raw materials. The corresponding NiFe2O4-NiO@C composites excellent crystallization two-stage oxidation low temperature. microstructure electrochemical behavior of the materials showed that Prussian blue analog was transformed into metal oxide while...

The evolution of the constituents an 8 wt%Ni-5 wt%Fe/MgAl2O4 catalyst for dry reforming methane (DRM) is monitored by in situ quick X-ray absorption spectroscopy (QXAS) and 57Fe Mössbauer spectroscopy. In as prepared state, Fe present NiFe2O4 at surface MgFe3+xAl2?xO4 within support, whereas Ni mainly NiO. During H2-TPR, NiO form alloy from 500 °C on partially reduced to MgFe2+xAl2?xO4, such th...