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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