共沉淀法制备Co掺杂ZnO的室温铁磁性的研究  

Room-temperature ferromagnetism in Co-doped ZnO fabricated by coprecipitation method

作　　者：严国清[1,2] 谢凯旋[1] 莫仲荣[1] 路忠林[3] 邹文琴[1] 王申[1] 岳凤娟[1] 吴镝[1] 张凤鸣[1] 都有为[1] 

机构地区：[1]南京大学物理系,南京210093 [2]宿州学院物理与电子工程系,宿州234000 [3]东南大学物理系,南京210096

出　　处：《物理学报》2009年第2期1237-1241,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2005CB623605);安徽省教育厅重点自然科学研究项目(批准号:KJ2008A26ZC)资助的课题~~

摘　　要：利用共沉淀法并在5vol.%H2/Ar气流中于300℃退火3h,制备了Zn1-xCoxO稀磁半导体.扫描电子微探针分析表明,对Co的名义组分分别为0.05,0.10,0.15的样品,其实际组分分别为x=0.054,0.100和0.159.X射线衍射表明,主相为纤锌矿结构,x=0.100和0.159的样品中含有CoO杂相.X射线光电子谱显示出Co有3种状态:替代进入ZnO晶格、CoO和金属Co.通过磁性测量,发现所有样品都具有室温铁磁性,但是磁性是非本征的,一方面来自金属Co团簇的磁性,另一方面来自Zn掺杂CoO1-δ的弱磁性.Nanocrystalline Zn 1-x CoxO samples were prepared by coprecipitation and annealing at 300 ℃ for 3 h in 5vol.%H2/Ar flow. Scanning electron microprobe measurements indicate that the samples with nominal Co contents of 0.05, 0.10, and 0.15 have the actual Co contents of 0.054, 0.100, and 0.159 respectively. X-ray diffraction patterns show that the major phase of the samples is of wurtzite structure, while the minor phase of CoO is observed in samples with Co contents of x=0.100 and 0.159. X-ray photoelectron spectroscopy shows that Co has three states： Co incorporated into ZnO matrix, CoO and metallic Co. It was found through magnetic measurements, that room-temperature ferromagnetism exists in all the samples and it comes from both the weak ferromagnetism of Zn-doped CoO 1-δ and the magnetism of metallic Co clusters.

关 键 词：稀磁半导体 ZNO 共沉淀法 磁性来源 

分 类 号：O484.43[理学—固体物理]