Study of physical properties of a ferrimagnetic spinel CuMnO: spin dynamics, magnetocaloric effect and critical behavior.

The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel CuMnO. The dynamic magnetic properties investigated using frequency-dependent ac magnetic susceptibility fitted using different phenomenological models such as Neel-Arrhenius, Vogel-Fulcher and power law, strongly indicate the presence of a cluster-glass-like behavior of CuMnO at 40 K. The magnetization data have revealed that our compound displays an occurrence of second-order paramagnetic (PM) to ferrimagnetic (FIM) phase transition at the Curie temperature = 80 K as the temperature decrease.

Structural, optical and dielectric properties of CuMnO spinel nanoparticles.

In this study, a CuMnO spinel was successfully synthesized by a sol-gel method at 500 °C for 5 h and characterized by different techniques. X-ray diffraction (XRD), Fourier transformation infrared (FTIR) spectroscopy and Raman spectroscopic analyses confirmed the formation of a spinel cubic structure with the 3̄ space group. The SEM proves that the grain size of our compound is of the order of 48 nm.

Magnetic and spectroscopic properties of Ni-Zn-Al ferrite spinel: from the nanoscale to microscale.

This article presents the annealing effect on the structural, elastic, thermodynamic, optical, magnetic, and electric properties of NiZnFeAlO (NZFAO) nanoparticles (NPs). The samples were successfully synthesized by the sol-gel method followed by annealing of the as-synthesized at 600, 800, 900, 1050, and 1200 °C. This approach yielded the formation of a highly crystalline structure with crystallite size ranging from 17 nm to 40 nm.