Exchange broadening of EPR line in ZnO:Co

We study the X-band EPR spectra of Co²⁺ in single crystalline Zn_1-xCo_xO (x = 0.001–0.075) thin films grown by plasma-assisted molecular beam epitaxy. By analyzing the EPR linewidth behavior we argue that the exchange-narrowing model, usually applied to Mn-based II-VI DMS, fails here and that a combined effect of exchange and dipolar broadening can explain the linewidth variation with Co content and temperature.

Key words: electron paramagnetic resonance, diluted magnetic semiconductors.

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