Kasper Aas Hunnestad

Om

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.

Forskning

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.

Publikasjoner

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

Research article in Nature Communication.

2025

Richarz, Leonie; Skogvoll, Ida Cathrine; Tokle, Egil Ytterli; Hunnestad, Kasper Aas; Ludacka, Ursula; He, Jiali. (2025) Ferroelectric Domain Walls for Environmental Sensors. ACS Applied Materials & Interfaces
Vitenskapelig artikkel

2024

Wolk, Katharina; Dragland, Ruben Skjelstad; Panduro, Elvia Anabela Chavez; Hjelmstad, Michael E.; Richarz, Leonie; Yan, Zewu. (2024) Coexistence of multi-scale domains in ferroelectric polycrystals with non-uniform grain-size distributions. Matter
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel Peter; Christiansen, Emil; Hunnestad, Kasper Aas. (2024) Imaging and structure analysis of ferroelectric domains, domain walls, and vortices by scanning electron diffraction. npj Computational Materials
Vitenskapelig artikkel
Hunnestad, Kasper Aas; Das, Hena; hatzoglou, constantinos; Holtz, Megan E.; Brooks, Charles M.; Helvoort, Antonius Van. (2024) 3D oxygen vacancy distribution and defect-property relations in an oxide heterostructure. Nature Communications
Vitenskapelig artikkel

2023

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
Vitenskapelig artikkel
Nordahl, Gregory; Jones, Lewys; Christiansen, Emil; Hunnestad, Kasper Aas; Nord, Magnus. (2023) Correcting for probe wandering by precession path segmentation. Ultramicroscopy
Vitenskapelig artikkel
Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, hatzoglou; Holtz, Megan E.; Brooks, Charles M.; Helvoort, Antonius Van. (2023) 3D oxygen vacancy order and defect-property relations in multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices. arXiv.org
Vitenskapelig artikkel
Hunnestad, Kasper Aas; Schultheiss, Jan Erich; Mathisen, Anders Christian; Ushakov, Ivan; Hatzoglou, Constantinos; Helvoort, Antonius Van. (2023) Quantitative Mapping of Chemical Defects at Charged Grain Boundaries in a Ferroelectric Oxide. Advanced Materials
Vitenskapelig artikkel
Hatzoglou, Constantinos; Costa, Gérald Da; 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
Vitenskapelig artikkel

2022

Gradauskaite, Elzbieta; Hunnestad, Kasper Aas; Meier, Quintin; Meier, Dennis; Trassin, Morgan. (2022) Ferroelectric Domain Engineering Using Structural Defect Ordering. Chemistry of Materials
Vitenskapelig artikkel
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
Vitenskapelig artikkel

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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel

2019

Hunnestad, Kasper Aas; Helvoort, Antonius Van. (2019) Visualizing Ferroelectric Domain Structures in ErMnO3 and Pb5Ge3O11 by Electron Microscopy. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
Mastergradsoppgave

Tidsskriftspublikasjoner

Richarz, Leonie; Skogvoll, Ida Cathrine; Tokle, Egil Ytterli; Hunnestad, Kasper Aas; Ludacka, Ursula; He, Jiali. (2025) Ferroelectric Domain Walls for Environmental Sensors. ACS Applied Materials & Interfaces
Vitenskapelig artikkel
Wolk, Katharina; Dragland, Ruben Skjelstad; Panduro, Elvia Anabela Chavez; Hjelmstad, Michael E.; Richarz, Leonie; Yan, Zewu. (2024) Coexistence of multi-scale domains in ferroelectric polycrystals with non-uniform grain-size distributions. Matter
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel Peter; Christiansen, Emil; Hunnestad, Kasper Aas. (2024) Imaging and structure analysis of ferroelectric domains, domain walls, and vortices by scanning electron diffraction. npj Computational Materials
Vitenskapelig artikkel
Hunnestad, Kasper Aas; Das, Hena; hatzoglou, constantinos; Holtz, Megan E.; Brooks, Charles M.; Helvoort, Antonius Van. (2024) 3D oxygen vacancy distribution and defect-property relations in an oxide heterostructure. Nature Communications
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Nordahl, Gregory; Jones, Lewys; Christiansen, Emil; Hunnestad, Kasper Aas; Nord, Magnus. (2023) Correcting for probe wandering by precession path segmentation. Ultramicroscopy
Vitenskapelig artikkel
Hunnestad, Kasper Aas; Das, Hena; Hatzoglou, hatzoglou; Holtz, Megan E.; Brooks, Charles M.; Helvoort, Antonius Van. (2023) 3D oxygen vacancy order and defect-property relations in multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices. arXiv.org
Vitenskapelig artikkel
Hunnestad, Kasper Aas; Schultheiss, Jan Erich; Mathisen, Anders Christian; Ushakov, Ivan; Hatzoglou, Constantinos; Helvoort, Antonius Van. (2023) Quantitative Mapping of Chemical Defects at Charged Grain Boundaries in a Ferroelectric Oxide. Advanced Materials
Vitenskapelig artikkel
Hatzoglou, Constantinos; Costa, Gérald Da; 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
Vitenskapelig artikkel
Gradauskaite, Elzbieta; Hunnestad, Kasper Aas; Meier, Quintin; Meier, Dennis; Trassin, Morgan. (2022) Ferroelectric Domain Engineering Using Structural Defect Ordering. Chemistry of Materials
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel

Rapport

Hunnestad, Kasper Aas; Helvoort, Antonius Van. (2019) Visualizing Ferroelectric Domain Structures in ErMnO3 and Pb5Ge3O11 by Electron Microscopy. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
Mastergradsoppgave

Formidling

3D-modeller på atomnivå lærer oss hvorfor dingser fungerer

Short promotion article for non-specialists.