STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network

Hwanhui Yun, Abhinav Prakash, Bharat Jalan, Jong Seok Jeong, K. Andre Mkhoyan

Research output: Contribution to journalArticle

Abstract

A study of the STEM probe channeling in a heterostructured crystalline bilayer specimens is presented here with a goal to guide STEM-based characterization of multilayer structures. STEM analysis of perovskite BaSnO3/LaAlO3 bilayers is performed and the dominating effects of beam channeling on HAADF- and LAADF-STEM are illustrated. To study the electron beam channeling through BaSnO3/LaAlO3 bilayers, probe intensity depth profiles are calculated, and the effects of probe defocus and atomic column alignment are discussed. Characteristics of the beam channeling are correlated to resulting ADF-STEM images, which is then tested by comparing focal series of plan-view HAADF-STEM images to those recorded experimentally. Additionally, discussions on how to visualize the misfit dislocation network at the BaSnO3/LaAlO3 interface using HAADF- and LAADF-STEM images are provided.

Original languageEnglish (US)
Article number112863
JournalUltramicroscopy
Volume208
DOIs
StatePublished - Jan 2020

Fingerprint

Dislocations (crystals)
Perovskite
Visualization
probes
laminates
Electron beams
Multilayers
alignment
electron beams
Crystalline materials
profiles
perovskite

Keywords

  • BaSnO
  • Channeling
  • Focal series
  • HAADF
  • Heterostructure
  • LAADF
  • LaAlO
  • Multislice
  • STEM

How much support was provided by MRSEC?

  • Partial

Reporting period for MRSEC

  • Period 6

PubMed: MeSH publication types

  • Journal Article

Cite this

STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network. / Yun, Hwanhui; Prakash, Abhinav; Jalan, Bharat; Jeong, Jong Seok; Mkhoyan, K. Andre.

In: Ultramicroscopy, Vol. 208, 112863, 01.2020.

Research output: Contribution to journalArticle

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abstract = "A study of the STEM probe channeling in a heterostructured crystalline bilayer specimens is presented here with a goal to guide STEM-based characterization of multilayer structures. STEM analysis of perovskite BaSnO3/LaAlO3 bilayers is performed and the dominating effects of beam channeling on HAADF- and LAADF-STEM are illustrated. To study the electron beam channeling through BaSnO3/LaAlO3 bilayers, probe intensity depth profiles are calculated, and the effects of probe defocus and atomic column alignment are discussed. Characteristics of the beam channeling are correlated to resulting ADF-STEM images, which is then tested by comparing focal series of plan-view HAADF-STEM images to those recorded experimentally. Additionally, discussions on how to visualize the misfit dislocation network at the BaSnO3/LaAlO3 interface using HAADF- and LAADF-STEM images are provided.",
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AU - Jeong, Jong Seok

AU - Mkhoyan, K. Andre

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