Ultra-low remanence and weak magnetic agglomeration of superparamagnetic magnetite nanoparticles caused by high magnetic moment Tb3+ doping

The structure and magnetic properties of the magnetite can be substantial corrected by incorporating foreign cations. In this work, Tb 3+ was successfully incorporated into magnetite and superparamagnetic magnetite nanoparticles were obtained, using solvothermal method. The doping of Tb 3+ greatly reduces the M r and H c values of the magnetite. Due to the doping of high magnetic moment Tb 3+ , the original magnetic moment of the magnetite is destroyed and magnetic domain are decomposed, resulting in a significant reduction in remanence and magnetic agglomeration. The remarkable effect of Tb 3+ doping degaussing will provide new prospects for the application of magnetite materials in the superparamagnetic direction.