Morphological Controlled Synthesis of FeCo Nanoparticles and Their Magnetic Properties

Objective: Controlled morphological FeCo nanoparticles with different Fe/Co ratios were prepared by a surfactant-free modified chemical reduction process in the water medium. Methods: Polyethylene glycol PEG 200 was used to protect from areal oxidation of FeCo alloy, and a mixture of hydrazine, sodium hydroxide was served as the reducing system in this process. Results: It was found that the shape of FeCo nanoparticles varied from flakes to cubes according to the atomic ratio of the metal precursors. X-ray diffraction (XRD) data showed that the prepared samples with different compositions got a single-phase body-centered-cubic structured FeCo alloy. Scanning Electron Microscopy (SEM) and transmission electron microscopy (TEM) confirmed all sample's atomic ratios and sizes (FeCo cubes with a size of similar to 130 nm). Conclusion: The vibrating Sample Magnetometer (VSM) measurements reveal that the Fe60Co40 had the highest magnetization of 208 emu/g among all samples.

Automated summary

Controlled morphological FeCo nanoparticles with different Fe/Co ratios were prepared by a surfactant-free modified chemical reduction process in the water medium. The shape of FeCo nanoparticles varied from flakes to cubes according to the atomic ratio of the metal precursors. Among all samples, Fe60Co40 had the highest magnetization of 208 emu/g according to the vibrating Sample Magnetometer (VSM) measurements.