Investigation of magneto-optical linear dichroism property of the TMA coated magnetic fluid

In this study magneto-optical linear dichroism (MOLD) effects of the Tetramethylammonium hydroxide (TMA) coated magnetic fluid was investigated. In our study MOLD and optical absorbtion properties of produced magnetic nanoparticles were investigated at the wavelength range of 550-900 nm. For this purpose MOLD measurement system was designed. External magnetic field applied up to 400G during the MOLD measurement. TMA coated magnetic nanoparticles produced by co-precipitation method at room temperature in nitrogen atmosphere. The magnetic, structural and size properties of the particles were measured using X-ray diffractometer (XRD), dynamic light scattering (DLS) and vibrating sample magnetometer (VSM). The saturation magnetization (Ms) of produced Fe₃O₄ was determined as 62 emu/g and the average particle size was 34 nm. It was observed that with the increase of absorption, the MOLD effect was getting increased.