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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=233.8 Oe are obtained for the Ar/H2 annealed samples with pure single phase structure when annealing temperature is 600 °C.
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 have 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 = 233.8 Oe are obtained for Ar / H2 annealed samples with pure single phase structure when annealing temperature is 600 ° C.