2011/03/23 by V. V. Strelchuk, K. A. Avramenko, Strelchuk, V. V. +17
Materials Science · Physics and Astronomy · #Copper-based nanomaterials and applications #Electronic and Structural Properties of Oxides #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #ZnO doping and properties #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1103.4463
10 pages, 9 figures, 2 tables
arxiv created 2011/03/23 · openalex publication_date 2011/03/23 · arxiv updated 2011/03/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.