Strain Tuning in Complex Oxide Epitaxial Films Using an Ultrathin Strontium Aluminate Buffer Layer

Di Lu, Yasuyuki Hikita, D Baek, Christopher Bell, tyler merz, HK Sato, Bonju Kim, Takeaki Yajima, A. Vailionis, L. Fitting-Kourkoutis, Harold Y. Hwang

Research output: Contribution to journalLetter (Academic Journal)peer-review

3 Citations (Scopus)
309 Downloads (Pure)

Abstract

A reliable method to apply biaxial strain over a wide range of values with minimal dislocation generation is critical for the study of strain dependent physical properties in oxide thin films and heterostructures. In this work, we systematically controlled the strain state in a perovskite manganite thin film by as much as 1% using a new ultrathin strain‐releasing buffer layer Sr3Al2O6, and observed signatures of accompanying magnetic and metal–insulator transitions. The near‐zero strain state is achieved within five nanometers of buffer layer thickness, substantially thinner than any oxide epitaxial buffer layers that can continuously tune the film strain states. Furthermore, the majority of misfit dislocations were confined to the Sr3Al2O6 layer, structurally decoupling defects in the film from the substrate.
Original languageEnglish
Article number1700339
Number of pages6
Journalphysica status solidi (RRL) - Rapid Research Letters
Volume12
Early online date5 Jan 2018
DOIs
Publication statusPublished - 2018

Keywords

  • buffer layers
  • epitaxy
  • oxides
  • Sr3Al2O6
  • strain control
  • strain relaxation

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