Yttrium iron garnet: Dodecahedral substitutions

Yttrium iron garnet (YIG) is a widely studied magnetic ceramic known for its low magnetic damping, high electrical resistivity, and low dielectric losses, which make it essential for various applications like microwave and radar systems, spintronic devices, oscillators, filters, phase shifters, and magneto-optical devices. The performance of YIG is closely linked to its physical properties, such as exchange interactions, Curie temperature, magnetic anisotropy, magneto-optic effects, and spin-wave dynamics. In recent years, there has been a growing interest in the impact of doping, particularly with rare earth, bismuth, and strontium elements, on YIG’s properties. Rare earth ions, with their shielded 4f electrons, introduce unique modifications in the dodecahedral sub-lattice, influencing phase formation, structural characteristics, magnetic behavior, and optical performance. This review aims to provide a comprehensive overview of how doping with rare earth elements, bismuth, and strontium affects YIG. It also highlights recent advances in synthesis methods, property optimization, and emerging applications, while emphasizing the role of dopants in tuning YIG for next-generation magneto-optical and spintronic technologies. Finally, the review identifies existing research gaps and suggests potential directions for future studies in this exciting area.