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Magnetism in Zn1−xMnxO crystal prepared by hydrothermal method

2005; Elsevier BV; Volume: 137; Issue: 5 Linguagem: Inglês

10.1016/j.ssc.2005.11.030

1879-2766

Huawei Zhang, Er‐Wei Shi, Zhi‐Zhan Chen, Xue‐Chao Liu, Bing Xiao,

Gas Sensing Nanomaterials and Sensors

Crystal Zn1−xMnxO magnetic semiconductors have been obtained by using a hydrothermal method for the first time at temperature of 703 K with substituent fraction ranging from x=0 to 0.04. X-ray diffraction and optical absorption measurements provide evidence for the locating at Zn site of Mn ion in ZnO crystals. The non-monotonic variation of band gap indicates the short-ranged interactions of sp–d electrons. However, no evidence of ferromagnetism is found in these systems down to T=2 K. The magnetization is found to be contributed from both free spins and spins associated with antiferromagnetic clusters. The antiferromagnetism is confirmed by fitting a Curie–Weiss function.