|NUKLEONIKA 2013, 58(3):359-363
EPR STUDY OF ZnO:Co THIN FILMS GROWN BY THE PLD METHOD
Bogumi│ Cieniek, Ireneusz Stefaniuk, Ihor Virt
Institute of Physics, University of Rzeszˇw,
16a Rejtana Str., 35-310 Rzeszˇw, Poland
We have studied magnetic properties of zinc-oxide composite doped with a relatively high concentration (4%) of Co ions. Samples were obtained by the pulsed laser deposition (PLD) method with different parameters of the laser ablation. For various samples, the power of laser was changed as well as the temperature of sample heating. Electron paramagnetic resonance (EPR) measurements were carried out and temperature dependence of the EPR spectra was obtained. Analysis of the temperature dependences of the integral intensity of EPR spectra was carried out using the Curie-Weiss law. Fitting yields the following values thetaCW = 150 K and C = 1.6710, where C is the Curie constant, and thetaCW is the paramagnetic Curie temperature.