Background and activities

I am a PhD candidate in the FACET group since August of 2019.

Main supervisor: Professor Dennis Gerhard Meier

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

Research

My research focuses on studying the ferroelectric domain structures of primarily improper ferroelectrics, including the hexagonal manganites and gadolynium molybnate, as well as proper systems such as lead germante. Using a range of correlated mircoscopy techniques including Scanning Probe Microscopy (SPM), Focused Ion Beam (FIB), Transmission Electron Microscopy (TEM) and most importantly an Atom Probe Tomography (APT) instrument, the goal is to characterize the materials at the atomic level. Specifically, the ferroelectric domain walls are of interest, and  obtaining the chemical composition and the charge distribution of the walls are the primary focus.

Background

Before my PhD position, I did my master's thesis at the TEM Gemini Centre here at NTNU, under the supervision of Professor Antonius T. J. van Helvoort, focusing on visualizing the ferroelectric domain structures of lead germante and erbium manganite by electron microscopy. The thesis was completed in June of 2019.

Scientific, academic and artistic work

Displaying a selection of activities. See all publications in the database

Report/dissertation

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

Others

  • 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.