Resonant soft x-ray scattering from La$_{\mbox{1-x}}$Sr$_{\mbox{x}}$MnO$_{\mbox{3}}$ quantum wire arrays

ORAL

Abstract

Any finite sized, patterned system with an energy gap is expected to have elementary excitations that are characteristic of its boundary. To test this idea we have fabricated large arrays ($>60000$ elements) of colossal magnetoresistance- phase $\mbox{La}_{\mbox{2/3}} \mbox{Sr}_{\mbox{1/3}} \mbox{MnO}_{\mbox{3}}$ quantum wires. These wires are 80 nm in width so have properties that are dominated by edge effects. We used resonant soft x-ray scattering (RSXS) and SQUID magnetometry to study their magnetic properties. We found that patterning lowers the Curie temperature and suppresses the degree of magnetization. RSXS studies show diffraction maxima from the wire period, as well as temperature-dependent diffuse scattering. We will discuss these results in the context of combined structural and magnetic disorder. Funding \#: DOE grants DE-FG02-07ER46453 and DE-FG02-06ER46285

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Authors

  • Shuai Wang

    Frederick Seitz Materials Research Laboratory, University of Illinois

  • Serban Smadici

    University of Illinois, Urbana-Champaign, Frederick Seitz Materials Research Laboratory, University of Illinois

  • James Lee

    University of Illinois, Urbana-Champaign, Frederick Seitz Materials Research Laboratory, University of Illinois

  • Michael Odlyzko

    Frederick Seitz Materials Research Laboratory, University of Illinois

  • Xiaofang Zhai

    Frederick Seitz Materials Research Laboratory, University of Illinois

  • James Eckstein

    Frederick Seitz Materials Research Laboratory, University of Illinois

  • Amish Shah

    Frederick Seitz Materials Research Laboratory, University of Illinois

  • Jian-Min Zuo

    Frederick Seitz Materials Research Laboratory, University of Illinois

  • P. Abbamonte

    University of Illinois, Urbana-Champaign, Dept of Physics, Seitz Materials Research Lab, Frederick Seitz Materials Research Laboratory, University of Illinois

  • Anand Bhattacharya

    Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Center for Nanoscale Materials and Materials Science Division, Argonne National Laboratory, Argonne National Lab