高纯度ZnO纳米粒子的铁磁行为
Ferromagnetic Behavior of High Purity ZnO nanoparticles
摘要：
采用化学法在水溶液中低温制备了具有纤锌矿结构的ZnO纳米粒子。纳米颗粒在约10至30 nm的范围内。从2K到室温及更高温度观察到铁磁性质。测定了磁化强度与温度、M（T）和等温测量M（H）的关系。矫顽场清楚地显示出室温以上的铁磁性。化学合成、与氧空位有关的体相结构缺陷是影响磁行为的主要因素。PACS编号：61.46.Hk纳米晶体，75.50.Pp磁性半导体，81.05.Dz II-VI半导体
英文摘要：
ZnO nanoparticles with Wurtzite structure were prepared by chemical methods at low temperature in aqueous solution. Nanoparticles are in the range from about 10 to 30 nm. Ferromagnetic properties were observed from 2 K to room temperature and above. Magnetization vs temperature, M(T) and isothermal measurements M(H) were determined. The coercive field clearly shows ferromagnetism above room temperature. The chemical synthesis, structural defects in the bulk related to oxygen vacancies are the main factors for the observed magnetic behavior. PACS numbers: 61.46.Hk Nanocrystals, 75.50.Pp Magnetic semiconductors, 81.05.Dz II-VI semiconductors
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