Blocking Temperature of Magnetite Nanoparticles Fe_3O_4 Encapsulated Silicon Dioxide SiO_2

摘要

One of the important characteristics of magnetic materials is the measurement of magnetic characteristics through Superconducting Quantum Interference Device (SQUID) especially magnetization temperature dependence M(T)zfc and MTfc measurement. In this work, we reported temperature dependence of magnetization for magnetite nanoparticles with and without SiO_2 under magnetic fields of 100 Oe. The magnetite nanoparticles were synthesized by co-precipitation method. It was calculated that the blocking temperature of magnetite nanoparticles Fe_3O_4 without and with SiO_2 encapsulation is 118.38 K and 209.03 K, respectively. The blocking temperatures of magnetic nanoparticles increase by SiO_2 encapsulation.