邀请讲座人：Gillian Anne Gehring 教授
简介：Gillian Anne Gehring，英国谢菲尔德大学名誉教授，博士生导师。1965年博士毕业于牛津大学。1968-1989年任牛津大学理论物理系讲师，圣休学院(St Hugh’ s College Oxford)导师。1989-2006年任谢菲尔德大学固体物理学教授。2006年至今，担任谢菲尔德大学名誉教授。2005年因在物理领域的杰出贡献被授予大英帝国勋章(O.B.E.)。曾荣获Leverhulme荣誉会员、英国物理学会名誉会员及莫特奖章（Mott Medal and Prize)和欧洲物理学会名誉会员等称号。其主攻于磁性与轨道有序的理论与实践研究，已在Nature Materials，Rep. Prog. Phys.，Phys. Rev. Lett.，Phys. Cond. Matt.等著名期刊发表论文200余篇，被引用6500余次，H因子33。曾任Journal of Physics: Condensed Matter，Europhysics Letters，New Journal of Physics等期刊编委或顾问编委。
【报告】Investigation of structural and magnetic properties of ZnO films doped with metallic Co, CoO, or Co3O4 by Pulsed Laser Deposition
时间: 2019年10月8日 上午10:00
地点: 仲英楼 材料学院 第一会议室
摘要：ZnO doped with a small amount of transition metal ions has attracted increased attention in the field of spintronics due to the prediction of room temperature ferromagnetism. In spite of the work that has been done on Co doped ZnO system, the origin of magnetism is still controversial. We investigate the structural, magnetic, and magneto-optical properties of Co-doped ZnO thin films grown by the PLD technique. The Co-doped ZnO films were grown from three different targets containing ZnO and either metallic Co, CoO, or Co3O4 as the precursor. The amount of oxygen in these targets varies due to the precursor; it is lowest for metallic Co and highest for Co3O4. The films made from these different targets were grown with differing values of the oxygen pressure in the PLD chamber; at base pressure and at four additional oxygen pressures between 10-1 Torr and 1 Torr. The aim of this work is to compare the effect on the magnetic properties of the films of changing the oxygen content of the target with that of changing the oxygen pressure in the PLD chamber. It was observed that the changed precursors affected the films in a different way compared with the oxygen pressure introduced into PLD chamber. This contrast to the behaviour of Fe doped In2O3.