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Kasper Aas Hunnestad

Kasper Aas Hunnestad

PhD Candidate
Department of Materials Science and Engineering
Faculty of Natural Sciences

kasper.a.hunnestad@ntnu.no
+4746827595 Realfagbygget, K1-202, Gløshaugen, Sem Sælands vei 12
ResearchGate Google Scholar
About Research Publications Media

About

Kasper Aas Hunnestad works as a PhD candidate in the FACET group since August of 2019, in the sub group Functional Topological Systems.

Main supervisor: Professor Dennis Gerhard Meier

Co-supervisor: Professor Antonius T. J. van Helvoort

Background

Before the PhD position, Kasper completed his master thesis at the TEM Gemini Centre here at NTNU, under the supervision of Professor Antonius T. J. van Helvoort, focusing on visualizing the domain structures of ferroelectric complex oxides by transmission electron microscopy. The thesis was completed in June of 2019.

Research

His research focuses on studying the defect chemistry of complex oxides by applying an advanced technique called atom probe tomography (APT). Primarily, bulk ferroelectric systems have been the main interest looking into low concentration doping and local chemical fluctuations in connection to the microsctructure. In addition, thin films and layered structures are being investigated where the aim is to resolve 3D structures and interfaces through their chemical signature. By applying APT we are able to resolve point defects at the atomic scale and bring new experimental insight into the defect chemistry of materials heavily investigated for their potential to be used in oxide electronics.

  • FACET
  • Functional Topological Systems
  • MiMaC - 3D Atom Probe

Publications

Atomic-scale 3D imaging of individual dopant atoms in an oxide semiconductor

Research article in Nature Communication.
  • Chronological
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2022

  • Gradauskaite, Elzbieta; Hunnestad, Kasper Aas; Meier, Quintin; Meier, Dennis; Trassin, Morgan. (2022) Ferroelectric Domain Engineering Using Structural Defect Ordering. Chemistry of Materials. volum 34 (14).
    Academic article
  • Hunnestad, Kasper Aas; Hatzoglou, Constantinos; Zeeshan, Muhammad; Vullum, Per Erik; Yan, Zewu; Bourret, Edith; Van Helvoort, Antonius; Selbach, Sverre Magnus; Meier, Dennis. (2022) Atomic-scale 3D imaging of individual dopant atoms in an oxide semiconductor. Nature Communications. volum 13 (1).
    Academic article
  • Hunnestad, Kasper Aas; Schultheiß, Jan; Mathisen, Anders Christian; Hatzoglou, Constantinos; Van Helvoort, Antonius; Meier, Dennis. (2022) Quantitative 3D mapping of chemical defects at charged grain boundaries in a ferroelectric oxide. arXiv.org.
    Academic article

2020

  • Bak, Ohheum; Holstad, Theodor Secanell; Tan, Yueze; Lu, Haidong; Evans, Donald; Hunnestad, Kasper Aas; Wang, Bo; McConville, James P. V.; Becker, Petra; Bohatý, Ladislav; Lukyanchuk, Igor; Vinokur, Valerii M.; Helvoort, Antonius T. J. van; Gregg, J Marty; Chen, Long-Qing; Meier, Dennis Gerhard; Gruverman, Alexei. (2020) Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate. Advanced Functional Materials. volum 30 (21).
    Academic article
  • Hunnestad, Kasper Aas; Roede, Erik Dobloug; Helvoort, Antonius T. J. van; Meier, Dennis Gerhard. (2020) Characterization of ferroelectric domain walls by scanning electron microscopy. Journal of Applied Physics. volum 128.
    Scientific translation/review

2019

  • Hunnestad, Kasper Aas; Van Helvoort, Antonius. (2019) Visualizing Ferroelectric Domain Structures in ErMnO3 and Pb5Ge3O11 by Electron Microscopy. 2019.
    Master thesis

Scientific articles

  • Gradauskaite, Elzbieta; Hunnestad, Kasper Aas; Meier, Quintin; Meier, Dennis; Trassin, Morgan. (2022) Ferroelectric Domain Engineering Using Structural Defect Ordering. Chemistry of Materials. volum 34 (14).
    Academic article
  • Hunnestad, Kasper Aas; Hatzoglou, Constantinos; Zeeshan, Muhammad; Vullum, Per Erik; Yan, Zewu; Bourret, Edith; Van Helvoort, Antonius; Selbach, Sverre Magnus; Meier, Dennis. (2022) Atomic-scale 3D imaging of individual dopant atoms in an oxide semiconductor. Nature Communications. volum 13 (1).
    Academic article
  • Hunnestad, Kasper Aas; Schultheiß, Jan; Mathisen, Anders Christian; Hatzoglou, Constantinos; Van Helvoort, Antonius; Meier, Dennis. (2022) Quantitative 3D mapping of chemical defects at charged grain boundaries in a ferroelectric oxide. arXiv.org.
    Academic article
  • Bak, Ohheum; Holstad, Theodor Secanell; Tan, Yueze; Lu, Haidong; Evans, Donald; Hunnestad, Kasper Aas; Wang, Bo; McConville, James P. V.; Becker, Petra; Bohatý, Ladislav; Lukyanchuk, Igor; Vinokur, Valerii M.; Helvoort, Antonius T. J. van; Gregg, J Marty; Chen, Long-Qing; Meier, Dennis Gerhard; Gruverman, Alexei. (2020) Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate. Advanced Functional Materials. volum 30 (21).
    Academic article

Journal publications

  • Hunnestad, Kasper Aas; Roede, Erik Dobloug; Helvoort, Antonius T. J. van; Meier, Dennis Gerhard. (2020) Characterization of ferroelectric domain walls by scanning electron microscopy. Journal of Applied Physics. volum 128.
    Scientific translation/review

Report

  • Hunnestad, Kasper Aas; Van Helvoort, Antonius. (2019) Visualizing Ferroelectric Domain Structures in ErMnO3 and Pb5Ge3O11 by Electron Microscopy. 2019.
    Master thesis

Media

3D-modeller på atomnivå lærer oss hvorfor dingser fungerer

Short promotion article for non-specialists.

2022

  • Academic lecture
    Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, Constantinos; Holtz, Megan E.; Brooks, Charles M.; Helvoort, Antonius T. J. van; Schlom, Darrell G.; Mundy, Julia A.; Meier, Dennis Gerhard. (2022) Quantifying interfacial defect accumulations in oxide superlattices. Atom Probe Tomography & Microscopy . International Field Emission Society; Nanjing, China. 2022-10-11 - 2022-10-14.
  • Academic lecture
    Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, Constantinos; Holtz, Megan, E.; Brooks, Charles M.; Van Helvoort, Antonius; Schlom, Darrel G.; Mundy, Julia A.; Meier, Dennis. (2022) Quantitative 3D imaging of oxygen defects in multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices. MRS Fall Meeting . Material research society; Boston. 2022-11-28 - 2022-12-03.
  • Poster
    Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, Constantinos; Holtz, Megan, E.; Brooks, Charles M.; Van Helvoort, Antonius; Schlom, Darrel G.; Mundy, Julia; Meier, Dennis. (2022) Quantifying charged defects in multiferroic superlattices using atom probe tomography. QUOROM-6 ; 2022-03-31 - 2022-03-31.
  • Academic lecture
    Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, Constantinos; Holtz, Megan, E.; Brooks, Charles M.; Van Helvoort, Antonius; Schlom, Darrell G.; Mundy, Julia A.; Meier, Dennis. (2022) 3D imaging of multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices by atom probe tomography. German Physical Association 2022 . German Physical Association; Regensburg. 2022-09-04 - 2022-09-09.
  • Academic lecture
    Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, Constantinos; Holtz, Megan, E.; Brooks, Charles M.; Van Helvoort, Antonius; Schlom, Darrell G.; Mundy, Julia A.; Meier, Dennis. (2022) Quantifying interfacial defect accumulations in oxide superlattices. Atom probe tomography & microcsopy ; 2022-10-11 - 2022-10-14.
  • Academic lecture
    Hunnestad, Kasper Aas; Hatzoglou, Constantinos; Khalid, Muhammad Zeeshan; Vullum, Per Erik; Zewu, Yan; Bourret, Edith; Van Helvoort, Antonius; Selbach, Sverre Magnus; Meier, Dennis. (2022) Atomic-Level Imaging and Quantification of Dopants in a Semiconducting Complex Oxide. MRS spring meeting . Material research society; 2022-05-10.
  • Academic lecture
    Hunnestad, Kasper Aas; Schultheiss, Jan; Roede, Erik Dobloug; Van Helvoort, Antonius; Meier, Dennis. (2022) 3D chemical mapping of grain boundaries in polycrystalline ferroelectrics. QUOROM-7 . QUOROM-7; Online. 2022-09-15 - 2022-09-15.
  • Poster
    Nordahl, Gregory; Jones, Lewys; Christiansen, Emil; Hunnestad, Kasper Aas; Nord, Magnus Kristofer. (2022) Precession segmentation to increase SPED image resolution. PICO2022 . Ernst Ruska-Centre (ER-C) for Microscopy and Spectroscopy with Electrons; Netherlands. 2022-05-08 - 2022-05-12.

2021

  • Poster
    Hunnestad, Kasper Aas; Hatzoglou, Constantinoss; Khalid, Muhammad Zeeshan; Vullum, Per Erik; Yan, Zewu; Bourret, Edith; Van Helvoort, Antonius; Meier, Dennis. (2021) Detection of Individual Dopants in a Semiconducting Functional Oxide. Atom probe tomography & microcsopy ; 2021-09-28.
  • Academic lecture
    Hunnestad, Kasper Aas; Hatzoglou, Constantinoss; Khalid, Muhammad Zeeshan; Vullum, Per Erik; Zewu, Yan; Bourret, Edith; Selbach, Sverre Magnus; Van Helvoort, Antonius; Meier, Dennis. (2021) 3D analysis of dopants in a multiferroic oxide by atom probe tomography. Norwegian Nanosymposium ; 2021-10-05.
  • Academic lecture
    Hunnestad, Kasper Aas; Hatzoglou, Constantinoss; Van Helvoort, Antonius; Meier, Dennis. (2021) Atomic-scale analysis of individual dopants in a functional oxide. German Physical Association ; 2021-09-28.

2019

  • Poster
    Hunnestad, Kasper Aas; Schultheiß, Jan; Holstad, Theodor S.; Van Helvoort, Antonius; Meier, Dennis. (2019) Nanoscale chemical mapping in 3D by atom probe tomography: Needle preparation. Norwegian Nanosymposium . Nano@NTNU; Trondheim. 2019-10-16 - 2019-10-18.
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