Evidence of defect-mediated magnetic coupling on hydrogenated Co-doped ZnO

JOURNAL OF ALLOYS AND COMPOUNDS

卷:555

Article

de Godoy, M. P. F.¹  Mesquita, A.²  Avansi, W.³  Neves, P. P.²  Chitta, V. A.⁴  Ferraz, W. B.⁵  Boselli, M. A.⁶  Sabioni, A. C. S.⁷  de Carvalho, H. B.² 

[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Alfenas, BR-37130000 Alfenas, MG, Brazil

[3] UNESP, Inst Quim, LIEC, INCTMN, BR-14800900 Araraquara, SP, Brazil

[4] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

[5] CNEN, Ctr Desenvolvimento Tecnol Nucl, BR-31270901 Belo Horizonte, MG, Brazil

[6] Univ Fed Uberlandia, BR-38400902 Uberlandia, MG, Brazil

[7] Univ Fed Ouro Preto, BR-35400000 Ouro Preto, MG, Brazil

关键词: Solid state reactions;    Oxide materials;    Magnetically ordered materials;    X-ray diffraction;    Scanning tunnelling microscopy;    STM, Synchrotron radiation;    Magnetic measurements;   

DOI  :  10.1016/j.jallcom.2012.11.105

来源: Elsevier

【 摘 要 】

Hydrogenated bulk Zn1-xCoxO samples were synthesized via standard solid-state reaction route with Co molar concentrations up to 15 at.%. Magnetic characterization demonstrates a room temperature ferromagnetic behavior associated to a paramagnetic Curie-Weiss component. Detailed microstructural analysis was carried out to exclude the presence of extrinsic sources of ferromagnetism. The magnetization increases linearly as a function of Co concentration. Hall measurements reveal an insulating character for the whole set of samples. In this context, the defect mediated magnetic coupling between the Co atoms under the scope of the bound magnetic polarons model is used to interpret the observed room temperature ferromagnetism. (C) 2012 Elsevier B.V. All rights reserved.

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