Reduction of conductivity and ferromagnetism induced by Ag doping in ZnO:Co

THIN SOLID FILMS

卷:545

Article

Bieber, H.¹  Colis, S.¹  Schmerber, G.¹  Pierron-Bohnes, V.¹  Boukhvalov, D. W.²  Kurmaev, E. Z.³  Finkelstein, L. D.³  Bazylewski, P.⁴  Moewes, A.⁴  Chang, G. S.⁴  Dinia, A.¹ 

[1] IPCMS, UMR 7504, UDS CNRS UDS ECPM, F-67034 Strasbourg 2, France

[2] KIAS, Sch Computat Sci, Seoul 130722, South Korea

[3] Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620990, Russia

[4] Univ Saskatchewan, Dept Phys & Engn Phys, Saskatoon, SK S7N 5E2, Canada

关键词: Diluted magnetic semiconductors;    Co-doping;    Soft X-ray spectroscopy;    Density functional theory modeling;    Pulsed laser deposition;   

DOI  :  10.1016/j.tsf.2013.07.043

来源: Elsevier

【 摘 要 】

Cobalt and silver co-doping has been undertaken in ZnO thin films grown by pulsed laser deposition in order to investigate the ferromagnetic properties in ZnO-based diluted magnetic materials and to understand the eventual relation between ferromagnetism and charge carriers. Hall transport measurements reveal that Ag doping up to 5% leads to a progressive compensation of the native n-type carriers. The magnetization curves show ferromagnetic contributions for all samples at both 5 K and room temperature, decreasing with increasing the Ag concentration. First principles modeling of the possible configurations of Co-Ag defects suggests the formation of nano-clusters around interstitial Co impurity as the origin of the ferromagnetism. The Ag co-doping results in a decrease of the total spin of these clusters and of the Curie temperature. (C) 2013 Elsevier B. V. All rights reserved.

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