Preparation and study magnetic properties of the nanosized ferrite Zn0.5Mn0.5Fe1.95Mo0.02Tb0.01Sm0.01Gd0.01O4 with negative magnetization. A new result

Abstract

ABSTRACT This work, concern the studies of the local atomic structure of the rare-earth doped Zn-Mn ferrite (Zn0.5Mn0.5Fe1.95Mo0.02Tb0.01Sm0.01Gd0.01O4), characterization techniques such as thermogravimetric analysis, X-ray diffraction (XRD), and Magnetic Properties Measurement System (MPMS), allowed us the effect of rare earth and their impacts on the structure, the size of nanocrystals, and the magnetic properties of the formed nano-ferrite. The XRD analysis showed that a single-phase was obtained at a low temperature of 500°C, with an environmentally friendly process, and nanometric size (8 nm). Magnetic measurements show a superparamagnetic behavior at 80 and 300 K and a week ferrimagnetism at 5 K. Furthermore, these measurements showed that this sample exhibits negative magnetization under zero-field cooled measurements (ZFC) with a low applied field (100 Oe), while the magnetization remains positive under field-cooled (FC) measurement conditions for the same applied field, which is a new result never observed in the case of Zn-Mn doped nano-ferrite.