Now showing items 1-11 of 11

• #### Ab Initio Studies of Functional Oxides for Thin Film Applications ﻿

(Doctoral theses at NTNU;2017:352, Doctoral thesis, 2017)
To continue the tremendous growth that the electronics industry has experienced over the last half-century, new energy efficient nanoscale devices are needed. One promising route towards this end is to introduce novel ...
• #### Density functional theory investigations of octahedral connectivity in [001] and [111] directional perovskite superlattices ﻿

(Master thesis, 2018)
To be able to exploit the magnetic properties of antiferromagnetic transition metal oxide perovskites in spintronic devices, as magnetic random access memory (MRAM) devices, a better understanding of how these magnetic ...
• #### DFT studies of BaTiO3 interfaces ﻿

(Master thesis, 2016)
This thesis has explored some of the nuances of Density Funtional Theory, ferroelectricity and oxide perovskites, BaTiO$_3$ in particular. The effects of strain and crystal orientation on phase diagram and polarization in ...
• #### Estimating the Energy Consumption of Emerging Random Access Memory Technologies ﻿

(Master thesis, 2013)
In this work, a model for estimating the energy consumption of different types ofrandom access memory(RAM) technologies, likely to be commercially available by2017, has been developed. The goal for this model has been to ...
• #### First-principles study of the effect of (111) strain on octahedral rotations and structural phases of LaAlO3 ﻿

(Journal article; Peer reviewed, 2017)
The structural and electronic response of LaAlO3 to biaxial strain in the (111) plane is studied by density functional theory (DFT) and compared with strain in the (001) plane and isostatic strain. For (111) strain, in-plane ...
• #### Goldstone-like phonon modes in a (111)-strained perovskite ﻿

(Journal article; Peer reviewed, 2018)
Goldstone modes are massless particles resulting from spontaneous symmetry breaking. Although such modes are found in elementary particle physics as well as in condensed-matter systems like superfluid helium, superconductors, ...
• #### Magnetic domain configuration of (111)-oriented LaFeO3 epitaxial thin films ﻿

(Journal article; Peer reviewed, 2017)
In antiferromagnetic spintronics control of the domains and corresponding spin axis orientation is crucial for devices. Here we investigate the antiferromagnetic axis in (111)-oriented LaFeO3/SrTiO3, which is coupled to ...
• #### Octahedral coupling in (111)- and (001)-oriented La0.7Sr0.3MnO3/SrTiO3 heterostructures ﻿

(Journal article; Peer reviewed, 2018)
Rotations and distortions of oxygen octahedra in perovskites play a key role in determining their functional properties. Here, we investigate how octahedral rotations can couple from one material to another in La2/3Sr1/3 ...
• #### Spatially Confined Spin Polarization and magnetic sublattice control in (La,Sr)MnO3−δ Thin Films by Oxygen Vacancy Ordering ﻿

(Journal article; Peer reviewed, 2017)
Perovskite oxides are known for their strong structure property coupling and functional properties such as ferromagntism, ferroelectricity and high temperature superconductivity. While the effect of ordered cation vacancies ...
• #### Strain-phonon coupling in (111)-oriented perovskite oxides ﻿

(Journal article; Peer reviewed, 2017)
Strain-phonon coupling, in terms of the shift in phonon frequencies under biaxial strain, is studied by density functional theory calculations for 20 perovskite oxides strained in their (111) and (001) planes. While the ...
• #### The role of antiferromagnetic spin axis on magnetic reconstructions at the (111)-oriented La0.7Sr0.3MnO3/ LaFeO3 interface ﻿

(Journal article; Peer reviewed, 2018)
Engineering of emergent properties at oxide interfaces is an exciting route towards realizing oxide electronics. Such properties are often the result of a balance between cooperating and competing mechanisms in the materials ...