ZnO:Co diluted magnetic semiconductor or hybrid nanostructure for spintronics?

• DOI: 10.1007/s10853-010-4710-2
• Publication Date: 2010-06-23T14:11:20Z
• Authors: F. Golmar; M. Villafuerte; A. Mudarra Navarro; C. E. Rodríguez T...; J. Barzola-Quiquia; P. Esquinazi; S. P. Heluani
• Keywords: Magnetic semiconductor; Curie

We have studied the influence of intrinsic and extrinsic defects in the magnetic and electrical transport properties of Co-doped ZnO thin films. X ray absorption measurements show that Co substitute Zn in the ZnO structure and it is in the 2+ oxidation state. Magnetization (M) measurements show that doped samples are mainly paramagnetic. From M vs. H loops measured at 5 K we found that the values of the orbital L and spin S numbers are between 1 and 1.3 for L and S = 3/2, in agreement with the representative values for isolated Co 2+. The obtained negative values of the Curie-Weiss temperatures indicate the existence of antiferromagnetic interactions between transition metal atoms.<br/>To be published in Journal of Materials Science<br/>