Used in targeted drug delivery systems where the magnetic core allows guidance to specific sites in the body under external magnetic fields, while PEG coating improves biocompatibility and prolongs circulation time. Employed in magnetic resonance imaging (MRI) as a contrast agent due to strong superparamagnetic properties. Applied in bioseparation processes to isolate cells, proteins, or nucleic acids thanks to easy magnetic separation and reduced non-specific binding. Utilized in hyperthermia treatment for cancer, where alternating magnetic fields generate localized heat to destroy tumor cells. Also serves as a reusable support in enzyme immobilization and catalysis, enhancing stability and recovery of biomolecules.