Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing

Cheng Yan¹, Li Wen-Xian^{2, 3}, Hao Wei-Chang^{1, †,}, Xu Huai-Zhe^{1, ‡,}, Xu Zhong-Fei¹, Zheng Li-Rong⁴, Zhang Jing⁴, Dou Shi-Xue³, Wang Tian-Min¹

ZFC and FC (for 1000 Oe)M–Hcurves measured at 5 K for (a) ZnMnO-H1 and (b) ZnMnO-H2. The insets show the enlarged low-field regions of these two samples.