Solid-source metal-organic molecular beam epitaxy for epitaxial SrRuO<sub>3</sub> films

ORAL

Abstract

SrRuO­3 is the metal electrode of choice in complex oxide electronics due to its high room-temperature conductivity, thermal and chemical stability, and close lattice match with several oxide substrates for epitaxial growth. Challenges in the molecular beam epitaxy (MBE) growth of SrRuO3 thin films arises from the “stubbornness” of Ru, which is difficult to evaporate and to stabilize in the +4 oxidation state. Though electron-beam and ozone-assisted MBE has produced films with low defect densities, this approach raises concerns over flux instabilities. We present a novel solid-source metal-organic MBE approach to supply pre-oxidized Ru by subliming its solid metal-organic precursor in an effusion cell. We demonstrate the growth of phase pure, epitaxial SrRuO3 on SrTiO3 (001) and DyScO3 (110) substrates using high-resolution X-ray diffraction. Combining temperature-dependent electrical transport and magnetometry, we show epitaxial SrRuO3 on SrTiO3 (001) with robust ferromagnetism accompanied by an anomalous Hall effect below the Curie temperature of ~150 K. We discuss the effect of cation stoichiometry and epitaxial strain on the crystal structure, surface morphology, electronic and magnetic properties using X-ray spectroscopic techniques.

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Presenters

  • Anusha Kamath Manjeshwar

    • Department of Chemical Engineering and Materials Science, University of Minnesota

Authors

  • Anusha Kamath Manjeshwar

    • Department of Chemical Engineering and Materials Science, University of Minnesota

  • Anil Kumar Rajapitamahuni

    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA

  • Javier G Garcia Barriocanal

    • University of Minnesota
    • University of Minnesota, USA
    • Characterization Facility, University of Minnesota

  • DOOYONG LEE

    • University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota

  • Tristan K Truttmann

    • University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA

  • Jin Yue

    • University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota

  • William T Nunn

    • University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota

  • M. Zzaman

    • Department of Physics, Central University of South Bihar and Department of Physics, Jamia Millia Islamia (Central University)

  • R. Shahid

    • Department of Physics, Jamia Millia Islamia (Central University)

  • Kenta Amemiya

    • Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Japan

  • Vijay Raj Singh

    • Department of Physics, Central University of South Bihar

  • Richard D James

    • University of Minnesota
    • Department of Aerospace Engineering and Mechanics, University of Minnesota
    • Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, Minnesota 55455, United States

  • Bharat Jalan

    • University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA