摘要
Pure single phase of Zn0.95Co0.05O bulks were successfully prepared by solid-state reaction method. The effects of annealing atmosphere and temperature on the room temperature ferromagnetic behavior were investigated. The results show that the air-annealed samples has similar weak ferromagnetic behavior with the as-sintered samples, but the obvious ferromagnetic behavior is observed for the samples annealed in vacuum or Ar/H2 gas, indicating that the strong ferromagnetism is associated with high oxygen vacancies density. High saturation magnetization Ms=0.73 μB/Co and coercivity Hc=233.8Oe are obtained for the Ar/H2 annealed samples with pure single phase structure when annealing temperature is 600℃.
Pure single phase of Zn0.95Co0.05O bulks were successfully prepared by solid-state reaction method. The effects of annealing atmosphere and temperature on the room temperature ferromagnetic behavior were investigated. The results show that the air-annealed samples has similar weak ferromagnetic behavior with the as-sintered samples, but the obvious ferromagnetic behavior is observed for the samples annealed in vacuum or Ar/H2 gas, indicating that the strong ferromagnetism is associated with high oxygen vacancies density. High saturation magnetization Ms=0.73 μB/Co and coercivity Hc=233.8Oe are obtained for the Ar/H2 annealed samples with pure single phase structure when annealing temperature is 600℃.
基金
This work was supported by the National Basic Research Program (973) under Grant No. 2007CB31407
the International S&T Cooperation Program of China under Grant No. 2006DFA53410.
