Fabrication of Phase-Pure Sr2CrOsO6 Epitaxial Films

ORAL

Abstract

The newly discovered magnetic double perovskite Sr2CrOsO6 exhibits a combination of unique properties, including high Tc of 725 K, semiconducting band structure and nearly 100{\%} spin-polarized valence and conduction bands indicated by a number of theoretical calculations. We have grown epitaxial Sr2CrOsO6 thin films by off-axis ultrahigh vacuum sputtering using a stoichiometric Sr2CrOsO6 target made by multi-step solid state synthesis. Rietveld refinements of the x-ray diffraction (XRD) scans of the Sr2CrOsO6 target show mostly double perovskite Sr2CrOsO6 phase (a = 3.904 {\AA}) with less than 1{\%} secondary phases. Due to the perfect lattice match between Sr2CrOsO6 and SrTiO3, we chose LSAT substrates (a = 3.868 {\AA}) to grow Sr2CrOsO6 films. XRD results demonstrated phase-pure, fully epitaxial Sr2CrOsO6 (100) films on LSAT with a rocking curve FWHM of 0.32\r{ }. Magnetic measurements for bulk Sr2CrOsO6 show an extremely large magnetic anisotropy with a coercivity of 2T at 385 K.

*Funding for this research was provided by the Center for Emergent Materials at the Ohio State University, an NSF MRSEC (Award Number DMR-0820414).

–

Authors

  • J.M. Lucy

    • Department of Physics, The Ohio State University

  • A.J. Hauser

    • Ohio State University
    • The Ohio State University
    • Department of Physics, The Ohio State University

  • H.A. Seibel

    • Department of Chemistry, The Ohio State University

  • P.M. Woodward

    • Department of Chemistry, The Ohio State University

  • Fengyuan Yang

    • Ohio State University
    • The Ohio State University
    • The Ohio State University Department of Physics
    • Department of Physics, The Ohio State University