Effect of reaction time on the structural, morphological and magnetic properties of Fe30Co70 nanoparticles

다국어 초록 (Multilingual Abstract)

The bimetallic nanoparticles as soft magnetic materials possess functional applications due to the low hysteresis losses, large saturation magnetization and high ferromagnetic character. Interestingly, these properties can be optimized in a number of ways. In this paper, the Fe30Co70 nanoparticles were prepared by reducing the precursors using sodium borohydride. The reaction time plays an important part in upgrading the properties of the material. The nanoparticles, prepared with the reaction times: 40min and 10min, were characterized using x-ray diffraction (XRD), low voltage field emission scanning electron microscopy (LV FESEM) and dc-magnetization. The effect of the reaction time was noticeably observed on the structural, morphological and magnetic properties of the nanoparticles. The XRD patterns confirm the formation of single-phase Fe30Co70 nanoparticles with crystallite size in nm range. The low crystallite size was observed for the low reaction time as determined using Scherrer’s formula. The LV FESEM micrographs revealed the spherical shape morphology of the nanoparticles for 10 min reaction time. The nanoparticles were found to form chain-like structures with a reaction time of 40 min. The enhanced ferromagnetic character was observed with the high saturation magnetization at low reaction time. The enhanced reaction time has been found to hamper the magnetic properties of Fe30Co70 magnetic nanoparticles. Thus, the exquisite properties of Fe30Co70 nanoparticles were observed at a reaction time of 10 min, however, they were suppressed as the reaction time was increased to 40 mins.