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 en_US
ISSN 1089-7550
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 USA
公開徵稿
出版型式 ,電子版
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