Ultra-low remanence and weak magnetic agglomeration of superparamagnetic magnetite nanoparticles caused by high magnetic moment Tb~(3+) doping

摘要

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.