Topotactic Transformations in Cobaltite Thin Films

ORAL

Abstract

The development of next generation memory, logic, and energy conversion devices motivates the search for materials where their physical properties can be controlled through the migration of charged ions. Among the candidate materials, perovskite oxides ABO3 have received considerable interests because of their multitude of related phases such as the Grenier (ABO2.7), brownmillerite (BM, ABO2.5), square planar (ABO2), and Ruddlesden-Popper (RP, An+1BnO3n+1 where n = integer) phases. In this work, a series of topotactic transformations between these perovskite-related phases has been observed in La0.7Sr0.3CoO3-d thin films upon annealing under highly reducing conditions. At intermediate annealing conditions, a composite phase consisting of ferromagnetic Co nanoparticles embedded in a RP matrix was observed. We show that each structure possesses its own distinct set of physical properties including ferromagnetic/metallic, anti-ferromagnetic/insulating, and ferromagnetic/insulating phases. These results highlight the potential for harnessing these topotactic transformations in next-generation spintronic, neuromorphic, and energy conversion devices based on the movement of oxygen anions.

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Presenters

  • I-Ting Chiu

    • Chemical Engineering, University of California, Davis

Authors

  • I-Ting Chiu

    • Chemical Engineering, University of California, Davis

  • Minhan Lee

    • Materials Science and Engineering Program, University of California, San Diego
    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • Department of Physics, University of California San Diego

  • Shaobo Cheng

    • Canadian Centre for Electron Microscopy and Department of Materials Science and Engineering, McMaster University
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
    • Brookhaven National Laboratory

  • Zhen Zhang

    • School of Materials Engineering, Purdue University, West Lafayette, IN 47907
    • School of Materials Engineering, Purdue University

  • Shenli Zhang

    • Pritzker School of Molecular Engineering, The University of Chicago

  • Pavel Lapa

    • Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
    • Department of Physics, University of California, San Diego
    • Materials Science Division, Argonne National Laboratory

  • Larry Heki

    • Department of Electrical and Computer Engineering, University of California, Santa Barbara

  • Mingzhen Feng

    • Department of Materials Science and Engineering, University of California, Davis

  • Padraic Shafer

    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Alpha N'Diaye

    • Advanced Light Source
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley Laboratory, E O Lawrence Berkeley National Laboratory, Berkeley, CA, US, academic/govt
    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Apurva Mehta

    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
    • Stanford Synchrotron Radiation Lightsource, Stanford Synchrotron Radiation Lightsource, Menlo Park, CA, US, academic/physics
    • Stanford Synchrotron Radiation Lightsource

  • Jon Schuller

    • Department of Electrical and Computer Engineering, University of California, Santa Barbara

  • Giulia Galli

    • The University of Chicago
    • Pritzker School of Molecular Engineering, The University of Chicago
    • Pritzker School of Molecular Engineering, University of Chicago
    • University of Chicago
    • Department of Chemistry, University of Chicago
    • Materials Science Division and Center for Molecular Engineering, Argonne National Laboratory

  • Shriram Ramanathan

    • School of Materials Engineering, Purdue University, West Lafayette, IN 47907
    • School of Materials Engineering, Purdue University
    • Materials engineering, Purdue University

  • Yimei Zhu

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science Department, Brookhaven National Lab
    • Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory
    • Condensed Matter Physics, Brookhaven National Laboratory

  • Ivan K Schuller

    • Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
    • Department of Physics, University of California San Diego

  • Yayoi Takamura

    • Department of Materials Science and Engineering, University of California, Davis
    • University of California, Davis