Widely used in biomedical applications due to their superparamagnetic properties and biocompatibility. Commonly employed in targeted drug delivery, where the magnetic core allows guidance to specific tissues under an external magnetic field, while the PEG coating enhances circulation time and reduces immune clearance. Frequently used in magnetic resonance imaging (MRI) as contrast agents to improve visualization of tumors and inflammatory sites. Also applied in hyperthermia treatment for cancer, where alternating magnetic fields generate localized heat to destroy malignant cells. Useful in bioseparation processes, such as isolation of DNA, proteins, or specific cells from complex mixtures, thanks to easy magnetic separation. PEGylation minimizes aggregation and improves stability in physiological environments, making these nanoparticles suitable for in vivo applications.