arxiv: 1103.4463 · v1 · pith:SG4XCAR4new · submitted 2011-03-23 · ❄️ cond-mat.mtrl-sci

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

V.V. Strelchuk , K.A. Avramenko , V.P. Bryksa , P.M. Lytvyn , M.Ya. Valakh , V.O. Pashchenko , O.M. Bludov , C. Deparis

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C. Morhain P. Tronc

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classification ❄️ cond-mat.mtrl-sci

keywords filmsmagneticbeamco-dopedepitaxyferromagneticgrownmolecular

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We studied structural, optical and magnetic properties of high-quality 5 and 15% Co-doped ZnO films grown by plasma-assisted molecular beam epitaxy (MBE) on (0001)-sapphire substrates. Magnetic force microscopy (MFM) and magnetic measurements with SQUID magnetometer show clear ferromagnetic behavior of the films up to room temperature whereas they are antiferromagnetic below 200 K approximately. Temperature dependence of the carrier mobility was determined using Raman line shape analysis of the longitudinal-optical-phonon-plasmon coupled modes. It shows that the microscopic mechanism for ferromagnetic ordering is coupling mediated by free electrons between spins of Co atoms. These results bring insight into a subtle interplay between charge carriers and magnetism in MBE-grown Zn(1-x)CoxO films.

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

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