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Fabrication of Spatially Confined Complex Oxides
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Engineering Oxide Epitaxy beyond Substrate Constraint.

Mingqiang Cheng1,2,3, Changjian Li2,3, Qiangli Wang2

  • 1Harbin Institute of Technology, Harbin, Heilongjiang 150001, China.

Nano Letters
|June 24, 2024
PubMed
Summary

Researchers developed a new method for controlling thin film orientation using a strontium ruthenium oxide (SRO) buffer layer. This technique enables the growth of [111]-oriented functional oxides on various substrates, overcoming previous limitations in epitaxy.

Keywords:
buffer layerinterfacial energyorientation engineeringscanning transmission electron microscopythin film epitaxy

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Thin Film Growth

Background:

  • Controlling thin film orientation is essential for advanced electronic devices.
  • Existing methods are often limited by substrate constraints, hindering the growth of desired crystallographic orientations.
  • Developing versatile strategies for orientation engineering is crucial for novel material applications.

Purpose of the Study:

  • To engineer the orientation of thin films beyond the limitations imposed by substrate crystallography.
  • To demonstrate a general method for achieving [111]-oriented epitaxial growth of functional oxides.
  • To overcome the substrate constraint in thin film epitaxy for broader material design.

Main Methods:

  • Density functional theory (DFT) calculations guided the experimental design.
  • Strontium ruthenium oxide (SRO) was employed as a buffer layer for epitaxial growth.
  • CoFe2O4 (CFO) thin films were deposited on various SrTiO3 (STO) substrates ([001]-, [110]-, and [111]-oriented).
  • X-ray Φ scans and aberration-corrected scanning transmission electron microscopy (AC-STEM) were used for structural characterization.

Main Results:

  • Successfully deposited [111]-oriented CoFe2O4 (CFO) on [001]-, [110]-, and [111]-oriented SrTiO3 (STO) substrates using an SRO buffer layer.
  • Enabled subsequent growth of [111]-oriented functional oxides, such as PbTiO3 (PTO), overcoming substrate limitations.
  • Observed specific epitaxial relationships, including four variants of [111]-CFO on [001]-STO and two variants on [110]-STO, accommodating lattice misfit strain.
  • Demonstrated the general applicability of the SRO buffer strategy to other substrates like lanthanum aluminate and yttria-stabilized zirconia.

Conclusions:

  • The SRO buffer layer strategy provides a general pathway for orientation engineering in oxide epitaxy.
  • This method overcomes the substrate constraint, enabling precise control over thin film crystallographic orientation.
  • The findings open new possibilities for designing and fabricating complex oxide heterostructures with tailored properties.