Cobalt‐doped ZnO prepared by electrochemistry: Chemistry, morphology, and magnetism

Abstract

ZnO:Co thin films are prepared by electrochemical deposition at different overpotentials and investigated by scanning electron microscopy, optical spectroscopy, and cathodoluminescence, X-ray photoelectron spectroscopy and Kerr magnetometry (MOKE). An increase of structural disorder and crystallite reorientation are observed for cobalt-doped samples. MOKE magnetometry revealed room-temperature ferromagnetic behavior only for ZnO:Co deposited at À850 mV. These are the samples with the lower cobalt content and lowest structural perturbation of the ZnO matrix by cobalt.

Cu codoping control over magnetic precipitate formation in ZnCoO nanowires

“…4(c)), ferromagnetic-like characteristics including saturation, coercivity and remanence are clearly exhibited, with small values of the coercivity (300 Oe), saturation magnetization (M S ∼0.07 emu/g) and remanence ratio (M R /M S =0.18), as are typically reported for DMS [24,25]. These results are very similar to the M-H behavior of electrodeposited thin films of ZnCoO [26] investigated by SQUID magnetometry (not shown) and are also consistent with reports from other groups on Cucodoped ZnCoO in bulk [27,28] and thin film [29,30] forms.…”

Role of defects in one-step synthesis of Cu-doped ZnO nano-coatings by electrodeposition method with enhanced magnetic and electrical properties

“…Among these, electrodeposition is simple with a direct approach by adding an appropriate proportion of dopant into the electrolyte solution. Besides, it is cost effective and a low-temperature fabrication technique [35,36]. Moreover, there are very less number of reports on the growth of Cu-doped ZnO by electrodeposition method showing room-temperature ferromagnetism (RTFM).…”

Hydrothermal–electrochemical growth of heterogeneous ZnO: Co films

“…To date, considerable attention has been paid to metal doping. Studies (Ohtomo et al 1998;Matei et al 2010;Yin et al 2004;Liu et al 2008;Lawes et al 2005;Jug and Tikhomirov 2009). Among these materials, Co-doped ZnO crystals receive growing attention (Matei et al 2010;Liu et al 2008;Chang et al 2012;Bohle and Spina 2010;Yao and Zeng 2009).…”