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Kasper Aas Hunnestad

Kasper Aas Hunnestad

Postdoctoral Fellow
Department of Electronic Systems
Faculty of Natural Sciences

kasper.a.hunnestad@ntnu.no
+4746827595 Realfagbygget, K1-202, Gløshaugen, Sem Sælands vei 12
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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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  • See all publications in Cristin

2023

  • Nordahl, Gregory; Jones, Lewys; Christiansen, Emil; Hunnestad, Kasper Aas; Nord, Magnus. (2023) Correcting for probe wandering by precession path segmentation. Ultramicroscopy
    Short communication
  • Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, hatzoglou; Holtz, Megan E.; Brooks, Charles M.; Van Helvoort, Antonius. (2023) 3D oxygen vacancy order and defect-property relations in multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices. arXiv.org
    Academic article
  • Hunnestad, Kasper Aas; Hatzoglou, hatzoglou; Vurpillot, F.; Nylund, Inger-Emma; Yan, Z.; Bourret, E.. (2023) Correlating laser energy with compositional and atomic-level information of oxides in atom probe tomography. Materials Characterization
    Academic article
  • Hunnestad, Kasper Aas; Schultheiß, Jan; Mathiesen, Anders; Ushakov, Ivan; hatzoglou, constantinos; Van Helvoort, Antonius. (2023) Quantitative Mapping of Chemical Defects at Charged Grain Boundaries in a Ferroelectric Oxide. Advanced Materials
    Academic article
  • hatzoglou, constantinos; Da Costa, Grald; Wells, Peter; Ren, Xiaochen; Geiser, Brian P; Larson, David J. (2023) Introducing a Dynamic Reconstruction Methodology for Multilayered Structures in Atom Probe Tomography. Microscopy and Microanalysis
    Academic article

2022

  • Hunnestad, Kasper Aas; Hatzoglou, Constantinos; Khalid, Muhammad Zeeshan; Vullum, Per Erik; Yan, Zewu; Bourret, Edith. (2022) Atomic-scale 3D imaging of individual dopant atoms in an oxide semiconductor. Nature Communications
    Academic article
  • Gradauskaite, Elzbieta; Hunnestad, Kasper Aas; Meier, Quintin; Meier, Dennis; Trassin, Morgan. (2022) Ferroelectric Domain Engineering Using Structural Defect Ordering. Chemistry of Materials
    Academic article

2020

  • 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
    Academic literature review
  • Bak, Ohheum; Holstad, Theodor Secanell; Tan, Yueze; Lu, Haidong; Evans, Donald; Hunnestad, Kasper Aas. (2020) Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate. Advanced Functional Materials
    Academic article

2019

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

Journal publications

  • Nordahl, Gregory; Jones, Lewys; Christiansen, Emil; Hunnestad, Kasper Aas; Nord, Magnus. (2023) Correcting for probe wandering by precession path segmentation. Ultramicroscopy
    Short communication
  • Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, hatzoglou; Holtz, Megan E.; Brooks, Charles M.; Van Helvoort, Antonius. (2023) 3D oxygen vacancy order and defect-property relations in multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices. arXiv.org
    Academic article
  • Hunnestad, Kasper Aas; Hatzoglou, hatzoglou; Vurpillot, F.; Nylund, Inger-Emma; Yan, Z.; Bourret, E.. (2023) Correlating laser energy with compositional and atomic-level information of oxides in atom probe tomography. Materials Characterization
    Academic article
  • Hunnestad, Kasper Aas; Schultheiß, Jan; Mathiesen, Anders; Ushakov, Ivan; hatzoglou, constantinos; Van Helvoort, Antonius. (2023) Quantitative Mapping of Chemical Defects at Charged Grain Boundaries in a Ferroelectric Oxide. Advanced Materials
    Academic article
  • hatzoglou, constantinos; Da Costa, Grald; Wells, Peter; Ren, Xiaochen; Geiser, Brian P; Larson, David J. (2023) Introducing a Dynamic Reconstruction Methodology for Multilayered Structures in Atom Probe Tomography. Microscopy and Microanalysis
    Academic article
  • Hunnestad, Kasper Aas; Hatzoglou, Constantinos; Khalid, Muhammad Zeeshan; Vullum, Per Erik; Yan, Zewu; Bourret, Edith. (2022) Atomic-scale 3D imaging of individual dopant atoms in an oxide semiconductor. Nature Communications
    Academic article
  • Gradauskaite, Elzbieta; Hunnestad, Kasper Aas; Meier, Quintin; Meier, Dennis; Trassin, Morgan. (2022) Ferroelectric Domain Engineering Using Structural Defect Ordering. Chemistry of Materials
    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
    Academic literature review
  • Bak, Ohheum; Holstad, Theodor Secanell; Tan, Yueze; Lu, Haidong; Evans, Donald; Hunnestad, Kasper Aas. (2020) Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate. Advanced Functional Materials
    Academic article

Report

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

Media

3D-modeller på atomnivå lærer oss hvorfor dingser fungerer

Short promotion article for non-specialists.

2023

  • Poster
    Hunnestad, Kasper Aas; Schulteiss, Jan; Mathisen, Anders Christian; Ushakov, Ivan; Hatzoglou, Constantinos; Van Helvoort, Antonius. (2023) Quantitative chemical analysis of charged and electronically active grain boundaries. QUOROM-8 QUOROM-8 2023-02-16 - 2023-02-16
  • Academic lecture
    Hunnestad, Kasper Aas; Schultheiß, Jan; Mathiesen, Anders; Ushakov, Ivan; hatzoglou, constantinos; Roede, Erik Dobloug. (2023) 3D mapping of grain boundary chemistry in ferroelectrics . German Physical Association 2023 2023-03-13 - 2023-03-17
  • Poster
    Hunnestad, Kasper Aas; Das, Hena; hatzoglou, constantinos; Holtz, Megan, E.; Brooks, Charles M.; Van Helvoort, Antonius. (2023) Quantifying charged defects in multiferroic superlattices using atom probe tomography. Ferroelectrics 2023-04-22 - 2023-04-24

2022

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

2021

  • 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 -
  • Academic lecture
    Hunnestad, Kasper Aas; Hatzoglou, Constantinoss; Khalid, Muhammad Zeeshan; Vullum, Per Erik; Zewu, Yan; Bourret, Edith. (2021) 3D analysis of dopants in a multiferroic oxide by atom probe tomography. Norwegian Nanosymposium 2021-10-05 -
  • Poster
    Hunnestad, Kasper Aas; Hatzoglou, Constantinoss; Khalid, Muhammad Zeeshan; Vullum, Per Erik; Yan, Zewu; Bourret, Edith. (2021) Detection of Individual Dopants in a Semiconducting Functional Oxide. Atom probe tomography & microcsopy 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. Nano@NTNU Norwegian Nanosymposium , Trondheim 2019-10-16 - 2019-10-18
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