Effect of Gd~(3+) Dopping on Structure, Magnetic Properties and Heat Effect of Mn-Zn Ferrites

Gd3+-doped Mn-Zn ferrite narioparticles were prepared by a chemical co-precipitation method. The effect of Gd3+ contents on structure, magnetic properties and heat effect under AC magnetic field was also investigated. The results show that Gd3+ can enhance the magnetic properties and heat effect of Mn-Zn ferrites with the proper doped amount. Among the samples prepared, Mno.4Zn0.6Gd0.06Fei.94O4 particles with the size of 20nm possess the maximal magnetization Ms and coercive force Hc. The temperature rise of the suspension of 50g sample and 1mL water can reach up to 31℃under a 60kHz magnetic field, showing the sufficient heating ability for hyperthermia therapies. The results support the concept that the Gd3+-doped Mn-Zn ferrite nanoparticles may serve as new thermal seeds for magnetic hyperthermia.