Low-temperature magnetic properties of NiCrxFe2–xO4 ferrites
Vasyl Stefanyk Precarpathian National University, 57 Shevchenko str.
76018 Ivano-Frankivsk, Ukrain
Received April 24, 2017, revised June29, 2017
Nickel-chrome ferrites with the general formula NiCrxFe2–xO4 (x = 0.0; 0.1; 0.2; 0.3; 0.4 and 0.5) were obtained using low-temperature technology sol-gel with participation of auto-combustion. The hysteresis loop of the samples has proved that the samples are soft magnetic material because of their low coercivity which at 77 K is in the range 2484–4283 A/m. The residual induction Br of the magnetic field with increasing Cr3+ concentration decreases due to the weakening of the interaction between the tetrahedral and octahedral sublattices of the ferrite with the spinel structure. The specific saturation magnetization σs for NiFe2O4 ferrite is 33.9 А∙m2/kg. It was defined blocking temperature Tb, the average value of which is 157 K.
PACS: 75.50.Gg Antiferromagnetics; PACS: 75.60.Nt Magnetic annealing and temperature-hysteresis effects; PACS: 75.60.–d Domain effects, magnetization curves and hysteresis; PACS: 75.75.+a Magnetic properties of nanostructures.