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《Acta Physica Sinica》 2012-13
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Influence of annealing ambience on the magnetic properties of doped ZnO films

Li Zhi-Wen (1)3)) Qi Yun-Kai (1)3)) Gu Jian-Jun (1)3)) Sun Hui-Yuan (2)3)) 1)(Department of Physics,Hebei Normal University for Nationalities,Chengde 067000,China ) 2)(College of Physics Science & Information Engineering,Hebei Normal University,Shijiazhuang 050016,China) 3)(Key Laboratory of Advanced Films of Hebei Province,Shijiazhuang 050016,China)  
The non-magnetic element A1 and magnetic element Co doped ZnO films are prepared by dc magnetron sputtering The films were annealed first in vacuum and then in air.The crystal structures are analyzed by x-ray diffraction(XRD) and magnetic properties are measured by Physical Properties Measurement System(PPMS).The results show that annealing ambience has a great influence on structure and magnetic property of sample A1 doped ZnO films annealed in vacuum show no room temperature ferromagnetism,but the ones annealed in air show room temperature ferromagnetism.The room temperature ferromagnetism may be associated with enhanced charge transfer between A1 and ZnO films annealed in air.And for Co doped ZnO films annealed in air annealed,the ferromagnetism is weakened.The change of magnetism may be related to the competition between enhanced magnetism resulting from charge transfer between A1 and ZnO and reduced magnetism resulting from interstitial Co atoms oxygenated.
【Fund】: 河北省自然科学基金(批准号:A2011101 A2012101001 A2009000254);; 河北民族师范学院科研基金(批准号:201105);; 河北省高等学校科学研究项目(批准号:Z2011101)资助的课题~~
【CateGory Index】: O484.43
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