Time- and strain-dependent nanoscale structural degradation in phase change epitaxial strontium ferrite films

Wang, Le; Yang, Zhenzhong; Wu, Jinpeng; Bowden, Mark E.; Yang, Wanli; Qiao, Amy; Du, Yingge

doi:10.1038/s41529-020-0120-3

Title: Time- and strain-dependent nanoscale structural degradation in phase change epitaxial strontium ferrite films

Abstract

Topotactic phase transition between metallic, perovskite SrFeO₃ and insulating, Brownmillerite SrFeO_2.5 has been extensively studied due to the potential applications in resistive switching devices for neuromorphic computing. However, its practical utilization as memristors has been hindered by the structural instability of SrFeO₃, which is often ascribed to the generation of oxygen vacancies to form SrFeO_3-δ. Here we reveal the dominating defects generated in SrFeO₃ epitaxial thin films are atomic scale gaps as a result of interfacial strain. Our correlated time- and strain-dependent measurements show that tensile strained SrFeO₃ films form vertical, nanoscale gaps that are SrO-rich, which are accountable for the observed metal-to-insulator transition over time. While compressively strained or small lattice mismatched SrFeO₃ films mainly yield horizontal gaps with a smaller impact on the in-plane transport. The atomic scale origin of such defects and their impact on device performance need to be further understood in order to integrate phase change materials in oxide electronics.

Authors:

Wang, Le ^[1]; Yang, Zhenzhong ^[1]; Wu, Jinpeng ^[2]; Bowden, Mark E. ^[3]; Yang, Wanli ^[2]; Qiao, Amy ^[1];

^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)

Publication Date:: Thu Jun 04 00:00:00 EDT 2020

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1645108

Alternate Identifier(s):: OSTI ID: 1775390

Report Number(s):: PNNL-SA-151481
Journal ID: ISSN 2397-2106

Grant/Contract Number:: AC05-76RL01830; 68278; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: npj Materials Degradation

Additional Journal Information:: Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2397-2106

Publisher:: Springer

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Chemistry; electronic devices

Citation Formats


                    Wang, Le, Yang, Zhenzhong, Wu, Jinpeng, Bowden, Mark E., Yang, Wanli, Qiao, Amy, and Du, Yingge. Time- and strain-dependent nanoscale structural degradation in phase change epitaxial strontium ferrite films.  United States: N. p., 2020. 
Web.  doi:10.1038/s41529-020-0120-3.

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                    Wang, Le, Yang, Zhenzhong, Wu, Jinpeng, Bowden, Mark E., Yang, Wanli, Qiao, Amy, & Du, Yingge. Time- and strain-dependent nanoscale structural degradation in phase change epitaxial strontium ferrite films.  United States.  https://doi.org/10.1038/s41529-020-0120-3

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                    Wang, Le, Yang, Zhenzhong, Wu, Jinpeng, Bowden, Mark E., Yang, Wanli, Qiao, Amy, and Du, Yingge. Thu .  
"Time- and strain-dependent nanoscale structural degradation in phase change epitaxial strontium ferrite films".  United States.  https://doi.org/10.1038/s41529-020-0120-3.  https://www.osti.gov/servlets/purl/1645108.

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@article{osti_1645108,

  title        = {Time- and strain-dependent nanoscale structural degradation in phase change epitaxial strontium ferrite films},

  author       = {Wang, Le and Yang, Zhenzhong and Wu, Jinpeng and Bowden, Mark E. and Yang, Wanli and Qiao, Amy and Du, Yingge},

  abstractNote = {Topotactic phase transition between metallic, perovskite SrFeO3 and insulating, Brownmillerite SrFeO2.5 has been extensively studied due to the potential applications in resistive switching devices for neuromorphic computing. However, its practical utilization as memristors has been hindered by the structural instability of SrFeO3, which is often ascribed to the generation of oxygen vacancies to form SrFeO3-δ. Here we reveal the dominating defects generated in SrFeO3 epitaxial thin films are atomic scale gaps as a result of interfacial strain. Our correlated time- and strain-dependent measurements show that tensile strained SrFeO3 films form vertical, nanoscale gaps that are SrO-rich, which are accountable for the observed metal-to-insulator transition over time. While compressively strained or small lattice mismatched SrFeO3 films mainly yield horizontal gaps with a smaller impact on the in-plane transport. The atomic scale origin of such defects and their impact on device performance need to be further understood in order to integrate phase change materials in oxide electronics.},

  doi          = {10.1038/s41529-020-0120-3},

  journal      = {npj Materials Degradation},

  number       = 1,

  volume       = 4,

  place        = {United States},

  year         = {Thu Jun 04 00:00:00 EDT 2020},

  month        = {Thu Jun 04 00:00:00 EDT 2020}

}

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Title: Time- and strain-dependent nanoscale structural degradation in phase change epitaxial strontium ferrite films

Abstract

Citation Formats

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A Ferrite Synaptic Transistor with Topotactic Transformation journal, March 2019

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Covalency-reinforced oxygen evolution reaction catalyst journal, September 2015

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Electric and Magnetic Properties of the Strontium Ferrates journal, September 1965

Static and Dynamic Optical Properties of La 1– x Sr x FeO 3−δ : The Effects of A-Site and Oxygen Stoichiometry journal, December 2015

Synthesis of freestanding single-crystal perovskite films and heterostructures by etching of sacrificial water-soluble layers journal, September 2016

Epitaxial Brownmillerite Oxide Thin Films for Reliable Switching Memory journal, March 2016

Impact of Sr segregation on the electronic structure and oxygen reduction activity of SrTi1−xFexO3 surfaces journal, January 2012

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Uncovering the Microstructure of BaSnCb Thin Films Deposited on Different Substrates Using TEM journal, August 2018

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Sr Segregation in Perovskite Oxides: Why It Happens and How It Exists journal, August 2018

Room Temperature Electrochemical Redox Reactions of the Defect Perovskite SrFeO 2.5+ x journal, September 1998

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