Exchange interactions between magnetic ions and free carriers in ZnMnO: An electron paramagnetic resonance analysis
Résumé
The magnetic interactions in n-type conductive Zn0.66Mn0.34O thin films with carrier concentrations of 2x10(18) cm(-3) have been investigated by X-band electron paramagnetic resonance (EPR) technique. We observe exclusively a single exchange narrowed Mn related EPR spectrum characterized by antiferromagnetic exchange interactions. The presence of free carriers modifies the EPR spectra by shifting the resonance fields to lower values. The shift can be modeled by the carrier polarization induced local magnetic field. (c) 2007 American Institute of Physics.