教師資料查詢 | 類別: 期刊論文 | 教師: 彭維鋒 Pong, Way-faung (瀏覽個人網頁)

標題:Coexistence of Intrinic and Extrinsic Origins of Room Temperature Ferromagnetism in as Implanted and Thermally Annealed ZnO Films Probed by X-ray Absorption Spectroscopy
學年101
學期2
出版(發表)日期2013/04/22
作品名稱Coexistence of Intrinic and Extrinsic Origins of Room Temperature Ferromagnetism in as Implanted and Thermally Annealed ZnO Films Probed by X-ray Absorption Spectroscopy
作品名稱(其他語言)
著者P. Satyarthi; S. Ghosh; B. Pandey; P. Kumar; Chen, C. L.; Dong, C. L.; Pong, W. F.; D. Kanjilal; K. Asokan ;P. Srivastava
單位淡江大學物理學系
出版者College Park: American Institute of Physics
著錄名稱、卷期、頁數Journal of Applied Physics 113(18), 183708(6 pages)
摘要The present work reports the structural and ferromagnetic properties of 200 KeV Ni 2+ ion implanted ZnO films before and after annealing at 650 °C in air and correlates these properties with their electronic structures. X-ray absorption spectroscopy (XAS) at Zn and Ni K-edges reveal that Zn metal cluster is absent in ZnO matrix, but there is an indication of clustering of Ni metal as a secondary phase. The XAS analysis of O K-edge shows (i) non-stoichiometric NiO segregation in as-implanted film and its absence/reduction in air annealed film, (ii) partial substitution of Ni 2+ ions at tetrahedral Zn sites, and (iii) presence of lattice defects such as oxygen vacancies in both films. The observed ferromagnetic behavior of as-implanted and air annealed films has both intrinsic as well as extrinsic origins. The intrinsic and extrinsic origins are discussed in terms of bound magnetic polaron model and presence of antiferromagnetic NiO phase/ferromagnetic Ni metal clusters, respectively.
關鍵字
語言英文(美國)
ISSN1089-7550
期刊性質國外
收錄於SCI;
產學合作
通訊作者P. Srivastava
審稿制度
國別美國
公開徵稿
出版型式,電子版
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