Influence of temperature on the structure and magnetic properties of thin films of cobalt ferrite

Abstract

The environmental problems that people are immersed in today does not lead to the search for new ways of obtaining methods or materials that solve this problem, materials with magnetic properties give a new solution to this problem. One of the materials with excellent magnetic properties is cobalt ferrite (CoFe2O4), for this reason this work gives an easy and novel way of obtaining this material in the form of thin films. The thin films of CoFe2O4 were deposited by spin coating on Pt substrates (Pt /TiO2/SiO2/Si) at different temperatures (700, 725 and 750 °C). For the precursor solution, iron nitrate [Fe (NO3)3 ∙ 9H2O] and cobalt nitrate [Co (NO3)2∙ 6H2O] were used, which were dissolved in 2 methoxyethanol, with magnetic stirring for two 2 h at 60 °C. In the characterization of the thin films, the structure and magnetic properties were studied by means of X-ray diffraction and a vibrating sample magnetometer. The X-ray diffraction pattern confirms the formation of the cubic spinel structure belonging to CoFe2O4 with the preferential peak (311) without trace of impurities at the temperatures studied. The calculated crystallites are in the range of 10 nm to 24.34 nm for all samples. The magnetic hysteresis shows that at the increase in temperature the magnetic properties also increase.