Used in biomedical applications such as targeted drug delivery, where the nanoparticles can be guided to specific sites in the body using external magnetic fields. Employed in magnetic resonance imaging (MRI) as contrast agents to enhance image clarity. Applied in hyperthermia treatment for cancer, where alternating magnetic fields heat the nanoparticles to destroy tumor cells. Utilized in biosensing and separation techniques, including magnetic cell sorting and detection of biomolecules. Also used in environmental remediation for the removal of contaminants from water through magnetic separation.