Kasper Aas Hunnestad
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.
Publications
2022
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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
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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
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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
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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
2022
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Academic lectureHunnestad, 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.
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Academic lectureHunnestad, 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.
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PosterHunnestad, 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.
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Academic lectureHunnestad, 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.
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Academic lectureHunnestad, 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.
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Academic lectureHunnestad, 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.
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Academic lectureHunnestad, 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.
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PosterNordahl, 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
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PosterHunnestad, 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.
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Academic lectureHunnestad, 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.
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Academic lectureHunnestad, 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
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PosterHunnestad, 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.