FeCo-based Ferrofluid for ELF Transmitter Applications

Developing compact and efficient extremely low frequency (ELF) transmitter antennas remains a challenge. A rotating magnetic dipole can be used for this application. In our approach we employ magnetic fluid, where suspended single domain nanoparticles act as rotating magnetic moments. The role of particle size and composition needed for optimal performance will be discussed. The FeCo nanoparticles were fabricated by wet chemical synthesis. Static magnetization and AC performance were measured. The role of nanoparticle concentration, type of superparamagnetic behavior, and AC permeability of FeCo magnetic fluid will be discussed.