Magnetic properties of Co 0.5 Zn 0.5 Fe 2 O 4 nanoparticles synthesized by a template-assisted hydrothermal Method

Abstract

In the present paper, nickel cobalt ferrite (Co 0.5 Zn 0.5 Fe 2 O 4) nanoparticles were synthesized using a template-assisted hydrothermal method. Carboxymethyl cellulose was used as the templating agent for controlling the morphology of the Co 0.5 Zn 0.5 Fe 2 O 4 nanoparticles. The synthesized nanoparticles were characterized using X-ray diffraction, scanning electron microscopy, and a vibrating sample magnetometer. The results indicated that the morphology of the nanoparticles changed from granular and superparamagnetic to platelike and ferromagnetic with the addition of the template. The Co 0.5 Zn 0.5 Fe 2 O 4 nanoparticles synthesized without the template exhibited a saturation magnetization and coercivity 2.81T and 0.2k·Am -1, while when the template was used, the saturation magnetization and coercivity increased to 3.13T and 76.6 k·Am -1 as the template proportion increased to 0.3. © 2011 H. Y. He.