Kasper Aas Hunnestad

About

Starting in 2023, Kasper Aas Hunnestad works as a postdoctoral fellow in the GAMES project, affiliated with the Center for Geophysical Forecasting.

Biography

Hunnestad obtained a Master's degree in 2019 in Applied Physics at the TEM Gemini Centre, Department of Physics, NTNU, under the supervision of Professor Antonius T. J. van Helvoort.

Following the Master's Degree, Hunnestad began a PhD position in the FACET group, Department of Materials Science, NTNU. The position was supervised by Professor Dennis Gerhard Meier, and completed in 2023.

Research

Current research

For his postdoctoral research, Hunnestad works on ultrasound measurements of CO₂ gas. A custom CO₂ tank laboratory is under construction at NTNU, instrumented with an array of ultrasonic transducers and flow-controlled gas injection capability to investigate the migration of gas in geological structures. The laboratory tank is a 1:2000 scaled environment which will be fitted with scaled models of real fields.

Previous research

His research during his PhD focused on studying the defect chemistry of complex oxides by applying an advanced microscopy technique called atom probe tomography (APT). Primarily, bulk ferroelectric systems have been my main interest, where I looked into low-concentration doping and local chemical fluctuations in connection to the microstructure. In addition, thin films and layered structures were investigated where the aim was to resolve 3D structures and interfaces through their chemical signature. By applying APT I was 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.

Publications

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

Research article in Nature Communication.

2024

Wolk, Katharina; Dragland, Ruben Skjelstad; Chavez Panduro, Elvia Anabela; Hjelmstad, Michael E.; Richarz, Leonie; Yan, Zewu. (2024) Coexistence of multi-scale domains in ferroelectric polycrystals with non-uniform grain-size distributions. Matter
Academic article
Hunnestad, Kasper Aas; Das, Hena; hatzoglou, constantinos; Holtz, Megan E.; Brooks, Charles M.; Van Helvoort, Antonius. (2024) 3D oxygen vacancy distribution and defect-property relations in an oxide heterostructure. Nature Communications
Academic article
Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel; Christiansen, Emil; Hunnestad, Kasper Aas. (2024) Imaging and structure analysis of ferroelectric domains, domain walls, and vortices by scanning electron diffraction. npj Computational Materials
Academic article
Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel; Christiansen, Emil; Hunnestad, Kasper Aas. (2024) Imaging and structure analysis of ferroelectric domains, domain walls, and vortices by scanning electron diffraction. npj Computational Materials
Academic article
Conroy, Michele; Småbråten, Didrik Rene; Ophus, Colin; Shapovalov, Konstantin; Ramasse, Quentin M.; Hunnestad, Kasper Aas. (2024) Observation of Antiferroelectric Domain Walls in a Uniaxial Hyperferroelectric. Advanced Materials
Academic article

2023

Nordahl, Gregory; Jones, Lewys; Christiansen, Emil; Hunnestad, Kasper Aas; Nord, Magnus. (2023) Correcting for probe wandering by precession path segmentation. Ultramicroscopy
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
Hatzoglou, Constantinos; Da Costa, Gérald; 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; 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; Schultheiss, Jan Erich; Mathisen, Anders Christian; 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

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

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
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

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

Wolk, Katharina; Dragland, Ruben Skjelstad; Chavez Panduro, Elvia Anabela; Hjelmstad, Michael E.; Richarz, Leonie; Yan, Zewu. (2024) Coexistence of multi-scale domains in ferroelectric polycrystals with non-uniform grain-size distributions. Matter
Academic article
Hunnestad, Kasper Aas; Das, Hena; hatzoglou, constantinos; Holtz, Megan E.; Brooks, Charles M.; Van Helvoort, Antonius. (2024) 3D oxygen vacancy distribution and defect-property relations in an oxide heterostructure. Nature Communications
Academic article
Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel; Christiansen, Emil; Hunnestad, Kasper Aas. (2024) Imaging and structure analysis of ferroelectric domains, domain walls, and vortices by scanning electron diffraction. npj Computational Materials
Academic article
Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel; Christiansen, Emil; Hunnestad, Kasper Aas. (2024) Imaging and structure analysis of ferroelectric domains, domain walls, and vortices by scanning electron diffraction. npj Computational Materials
Academic article
Conroy, Michele; Småbråten, Didrik Rene; Ophus, Colin; Shapovalov, Konstantin; Ramasse, Quentin M.; Hunnestad, Kasper Aas. (2024) Observation of Antiferroelectric Domain Walls in a Uniaxial Hyperferroelectric. Advanced Materials
Academic article
Nordahl, Gregory; Jones, Lewys; Christiansen, Emil; Hunnestad, Kasper Aas; Nord, Magnus. (2023) Correcting for probe wandering by precession path segmentation. Ultramicroscopy
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
Hatzoglou, Constantinos; Da Costa, Gérald; 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; 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; Schultheiss, Jan Erich; Mathisen, Anders Christian; 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
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
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
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

Report

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

Outreach

3D-modeller på atomnivå lærer oss hvorfor dingser fungerer

Short promotion article for non-specialists.

2024

Academic lecture

Dragland, Ruben Skjelstad; Wolk, Katharina; Chavez Panduro, Elvia Anabela; Richarz, Leonie Caroline; Yan, Zewu; Bourret, Edith. (2024) Ferroelectric Domains in DyMnO3 Polycrystals with Inhomogeneous Grain-size Distribution. NTNU European Conference on Application of Polar Dielectrics , Trondheim 2024-06-16 - 2024-06-19
Academic lecture

Dragland, Ruben Skjelstad; Wolk, Katharina; Chavez Panduro, Elvia Anabela; Hunnestad, Kasper Aas; Schultheiss, Jan Erich; Meier, Dennis. (2024) Domain Size Engineering by Grain Scaling in Polycrystalline Hexagonal DyMnO3. Die Deutsche Physikalische Gesellschaft DPG Frühjahrstagungen 2024 , Berlin 2024-03-17 - 2024-03-22

2023

Academic lecture

Van Helvoort, Antonius; Mathisen, Anders Christian; Schultheiss, Jan Erich; Hunnestad, Kasper Aas; Meier, Dennis; Correa, Leonardo. (2023) 4DSTEM for nm scale characterization of ferroelectrics. Dennis Meier Ferroelectrics Domains and Domain Walls, The Northern Lights Edition , Hurtigruten 2023-05-22 - 2023-05-25
Academic lecture

Mathisen, Anders Christian; Correa, Leonardo; Hunnestad, Kasper Aas; Schultheiss, Jan Erich; Christiansen, Emil; Meier, Dennis. (2023) Scanning precession electron diffraction of polycrystalline ferroelectrics. Royal Microscopy Society / EMAG (IOP) MMC/EMAG , Manchester 2023-07-04 - 2023-07-06
Poster

Dragland, Ruben Skjelstad; Wolk, Katharina; Chavez Panduro, Elvia Anabela; Hunnestad, Kasper Aas; Schultheiss, Jan Erich; Meier, Dennis. (2023) Non-uniform Grain Size Effects on Ferroelectric Domain Scaling in DyMnO3. NTNU Nano Norwegian Nanosymposium 2023 , Trondheim 2023-11-28 - 2023-11-29
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
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

2022

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; 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
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 -
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.; 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
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) 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; 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

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 -
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 -
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 -

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

Språkvelger

Kasper Aas Hunnestad