Spectroscopic Investigation of an Intrinsic Room Temperature Ferromagnetism in Co Doped ZnO Nanoparticles
學年 103
學期 1
出版（發表）日期 2014-08-01
作品名稱 Spectroscopic Investigation of an Intrinsic Room Temperature Ferromagnetism in Co Doped ZnO Nanoparticles
作品名稱（其他語言）
著者 Srinatha N.; B. Angadi; K. G. M. Nair; N. G. Deshpande; Y. C. Shao; W. F. Pong
單位
出版者
著錄名稱、卷期、頁數 Journal of Electron Spectroscopy and Related Phenomena 195, pp.179–184
摘要 Pure and Co substituted ZnO nano crystalline particles were prepared by solution combustion technique using l-Valine as a fuel. As synthesized powder samples were characterized by X-ray diffractometer and SQUID magnetometer to confirm the formation of single phase wurtzite structure and to study the bulk magnetic response of the sample, respectively. Magnetic studies show that Co doped ZnO nanoparticles exhibit ferromagnetism (FM) at room temperature (RT). Furthermore, the electronic structure and element specific magnetic properties were investigated by near-edge X-ray absorption fine structure (NEXAFS) and X-ray magnetic circular dichroism (XMCD) measurements, respectively. The effect of Co substitution on the spectral features of Co–ZnO at O K-edge, Co L3,2 edge, Zn L3,2 edge have been investigated. The spectral features of NEXAFS at Co L3,2 edge is entirely different from the spectral features of metallic clusters and other impurity phases, which rules out the presence of impurity phases. The valence state of ‘Co’ ion is found to be in +2 state. The FM nature of the sample was confirmed through XMCD spectra, which is due to the incorporation of divalent ‘Co’ ions. Hence the presented results confirm the substitution of ‘Co’ ions at ‘Zn’ site in the host lattice, which is responsible for the RTFM.
關鍵字 Dilute magnetic semiconductor;ZnO;l-Valine;SQUID;NEXAFS;XMCD
語言 en
ISSN 1873-2526
期刊性質 國外
收錄於 SCI
產學合作 國內 國外
通訊作者 B. Angadi
審稿制度 否
國別 NLD
公開徵稿
出版型式 ,電子版,紙本
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/104600 )