Our nano-Fe₃O₄ maintains magnetic particles at the nanoscale, featuring small particle size, high purity, large specific surface area, uniform distribution, and easy dispersibility. It finds wide use in magnetic sealing and the biomedical field. Leveraging its magnetic properties and deep black color, it’s also applied to make magnetic recording materials, high-gradient magnetic separators, microwave-absorbing materials, specialty coatings, and electrostatic copying developers.