Magnetoresistance characterization of nanocomposite Fe3O4 / PPy that synthesized with sol-gel spin coating method

Abstract

Indonesia is a rich country that has various natural resources, one of which is in the form of mining materials such as iron sand which contains a lot of magnetite (Fe₃O₄). Magnetite (Fe₃O₄) has superior properties compared to others so that magnetite (Fe₃O₄) is a top priority in research activities that are rapidly developing in world research. Polypyrrole (PPy) is a conductive polymer which has several advantages. Fe₃O₄ nanoparticles are a type of magnetic material that has considerable potential in GMR magnetic sensor applications. The aim of this research is to synthesize and characterize the effect of Fe₃O₄ composition on the magnetoresistance properties of Fe₃O₄/PPy nanocomposites synthesized by the Sol Gel spin coating method. In this study, several stages were carried out, namely: the sample preparation stage, the nanocomposite manufacturing stage, the characterization stage and the data analysis. Fe₃O₄/PPy thin layer nanocomposite is made from iron sand that has been purified and milled by previous researchers. Fe₃O₄/PPy nanocomposites were prepared using the sol-gel method with a variation of Fe₃O₄/PPy concentrations of 30%, 40%, 50%, 60% and 70% and then grown using the spin coating method with a rotating speed of 3000 rpm for 60 seconds, the thin layer formed was dried using a furnace at 550⁰C for 1 hour. Then the thin layer was characterized using XRF, FTIR, SEM and FPP. Based on all the characterizations that have been obtained, a thin layer of nanocomposite has been successfully grown on glass preparations. Fe₃O₄/PPy nanocomposite thin layer is a thin layer that has good magnetoresistance properties, this is shown in the results of testing the magnetoresistance properties using the Four Point Probe (FPP) method.