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: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
語言英文
ISSN1873-2526
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
國別荷蘭
公開徵稿
出版型式,電子版,紙本
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