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We studied structural, optical and magnetic properties of high-quality 5 and15% Co-doped ZnO films grown by plasma-assisted molecular beam epitaxy (MBE) on(0001)-sapphire substrates. Magnetic force microscopy (MFM) and magneticmeasurements with SQUID magnetometer show clear ferromagnetic behavior of thefilms up to room temperature whereas they are antiferromagnetic below 200 Kapproximately. Temperature dependence of the carrier mobility was determinedusing Raman line shape analysis of the longitudinal-optical-phonon-plasmoncoupled modes. It shows that the microscopic mechanism for ferromagneticordering is coupling mediated by free electrons between spins of Co atoms.These results bring insight into a subtle interplay between charge carriers andmagnetism in MBE-grown Zn(1-x)CoxO films.

Ferromagnetism in Co-doped ZnO films grown by molecular beam epitaxy: magnetic, electrical and microstructural studies