Mar'atus Sholikhah, Arif Hidayat, S.T. Ulfawanti Intan Subadra, Nandang Mufti, Muhammad Safwan Abd Aziz, Ahmad Taufiq
In this study, we explore the structural, magnetic, optical, and magnetic field sensor properties of CrxFe3–xO4 ferrofluids. The synthesis of CrxFe3–xO4 ferrofluids was started by preparing CrxFe3–xO4 nanoparticles using the coprecipitation method with x = 0.1, 0.2, and 0.3. The XRD patterns revealed that the increasing Cr3+ composition did not alter the structure of CrxFe3–xO4, but decreased the crystallite size. The FTIR spectra showed the presence of octahedral Cr–O, octahedral Fe–O, and tetrahedral Fe–O bonds. The hysteresis curves of nanoparticles indicated that the sample with x = 0 .1 exhibited ferrimagnetic properties, while the other samples displayed superparamagnetic properties with decreasing magnetization values. Additionally, the energy gap of the nanoparticles decreased with increasing Cr3+ composition. Furthermore, the absorbance intensity of the ferrofluids decreased with enhancing x values, as evidenced by the high refractive index values. In this work, the ferrofluids with x = 0.1 exhibited optimal performance as magnetic field sensors. © The Korean Magnetics Society. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia; Department of Physics, Faculty of Sciences, Universiti Teknologi Malaysia, Malaysia
