Co掺杂ZnO稀磁半导体的微观结构与磁学性质

Origin of Ferromagnetism in Co-doped ZnO Diluted Magnetic Semiconductors

用溶胶-凝胶方法制备了具有单一纤锌矿结构的Co掺杂ZnO稀磁半导体粉末样品.通过对样品的结构、元素价态、电学和磁学性质的分析,研究了样品室温铁磁性来源.研究结果表明,2次烧结的样品比1次烧结样品的磁化强度明显增强;观测到的铁磁性与ZnO本征缺陷(Zn空位)有关,铁磁性起源于局域化受主(Zn空位)之间的交换相互作用.

A sol-gel method to prepare Co-doped ZnO diluted magnetic semiconductors compound powders with single wurtize phase and room-temperature ferromagnetism is studied.On the basis of large amounts of processing exploration,a primary discussion and analysis are made for the observed room-temperature（RT） ferromagnetic state in the samples as well as its origin in combination with the structure analysis,the bonded state and the magnetic behavior of the samples.The study reveals that the powders which are 2nd sintered have larger magnetization than the powders which are sintered only once.The observed ferromagnetism in ZnO which is connected with the effect of Zn vacancies is mainly originated from the exchange interaction between localized acceptors（Zn vacancies）,and it＇s a intrinsic property of Co-doped ZnO compound powders.