Viser treff 1-20 av 31

• #### 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 ...
• #### Bi vacancy formation in BiFeO3 epitaxial thin films under compressive (001)-strain from first principles ﻿

(Peer reviewed; Journal article, 2019)
Point defects in BiFeO3 affect both structural and functional properties. To elucidate the role of single Bi vacancies and Bi–O vacancy pairs we investigate their stability and effect on structural and ferroelectric ...
• #### Characterization of BaTiO3/La0.7Sr0.3MnO3 Thin Films on SrTiO3(111) Substrates - A Transmission Electron Microscopy Study ﻿

(Master thesis, 2016)
In this work, an oxide thin film system was investigated by using transmission electron microscopy (TEM) techniques. It is of great interest to study such systems due to their current applications as well as potential ...
• #### 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 ...
• #### Electrical Transport Studies of (111)-Oriented BTO/LSMO-Based Heterostructures ﻿

(Master thesis, 2015)
Strain-induced magnetoelectric coupling in thin film heterostructures is a popular topic in the emerging field of multiferroic materials. Normally such heterostructures are grown with a (001) orientation, but (111)-oriented ...
• #### 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 ...
• #### Fabrication by electron beam lithography and preliminary studies by high resolution electron microscopy techniques of perovskite nanostructures ﻿

(Master thesis, 2007)
In order to study thin films of complex oxides deposited on discontinuous surfaces, necessary techniques to fabricate templates and analysis of templates and thin-film samples at atomic scale have been investigated. ...
• #### Fabrication of Multiferroic Tunnel Junctions on (111)-oriented SrTiO3 ﻿

(Master thesis, 2016)
The phenomenon of quantum mechanical electron tunneling is widely used in device technology, of which magnetic tunnel junctions (MTJ) have been important for many years and ferroelectric tunnel junctions (FTJ) are becoming ...
• #### Geometrical lattice engineering of oxide interfaces ﻿

(Doctoral theses at NTNU;2017:45, Doctoral thesis, 2017)
• #### Growth and Strain Relations in (001)-oriented Ferroelectric and Ferromagnetic Perovskite Oxide Thin Films ﻿

(Master thesis, 2013)
The wide range of properties offered by perovskite oxides demands high quality thin films and growth control on several interfaces. In this work, growth of ferroelectric BaTiO3 (BTO) on (001)-oriented SrTiO3 (STO) and ...
• #### In-plane structural order of domain engineered La0.7Sr0.3MnO3 thin films ﻿

(Journal article, 2013)
We present a detailed structural study of tensile-strained La0.7Sr0.3MnO3 thin films. We use the substrate miscut to control the number of rhombohedral variants in the films and study the in-plane order and structural ...
• #### Initial Growth of LaFeO3 on (111)-Oriented Substrates ﻿

(Master thesis, 2013)
Perovskite oxide thin films grown in the (111)-direction are, due to their expected novel properties resulting from the strong structural and electronic coupling, interesting for all oxide heterostructures. A prerequisite ...
• #### Interactions between point defects and internal interfaces in bismuth ferrite ﻿

(Doctoral theses at NTNU;2019:148, Doctoral thesis, 2019)
BiFeO3 (BFO) is the most studied multiferroic material and a promising candidate for future information storage. One challenge for practical applications of this material is a thorough understanding and control of the ...
• #### Investigation of Pulsed Laser Deposition Growth Parameters and their influence on the Sheet Resistance of a Complex Oxide Heterointerface ﻿

(Master thesis, 2011)
In this project, the growth parameters of Pulsed Laser Deposition are optimized in order to obtain a high quality interface between two complex oxides, LaAlO3 and SrTiO3. The prepared samples are compared by their sheet ...
• #### Karakterisering av magnetiske egenskaper til (111)-orienterte funksjonelle grensesjikt basert på komplekse oksider ﻿

(Master thesis, 2015)
Grenseflater i funksjonelle materialer er et voksende forskningsfelt med lovende utsikter for anvendelse i elektronikk. Oksidmaterialer utgjør et bredt spekter av funksjonelle egenskaper som gjør dem spesielt interessante ...
• #### Patterning of Hard Mask on (111)-Oriented BTO/LSMO Heterostructures on STO Substrates ﻿

(Master thesis, 2016)
Functional oxides exhibit properties that make them interesting for future electronic devices. Thin films of functional oxides can be routinely produced, but there lacks a standard technique for establishing nanoscale ...
• #### Potassium Sodium Niobate Thin Films by Chemical Solution Deposition ﻿

(Doktoravhandlinger ved NTNU, 1503-8181; 2014:300, Doctoral thesis, 2014)
Stable aqueous KNN-based precursor solutions were developed by using simple and cheap starting materials and good wetting of the precursor solution was secured by the addition of small amounts of polyvinylalcohol. The ...
• #### Propagation properties of spin wave in Co2FeAl Heusler alloy ultrathin films ﻿

(Peer reviewed; Journal article, 2021)
We report an investigation of spin wave propagation in ion beam sputtered Co2FeAl Heusler alloy thin film on Si(100) substrate. The spin wave transmission spectra measured at fixed frequencies by sweeping the external ...
• #### Reliability of piezoelectric microelectomecanical systems in humid conditions ﻿

(Doctoral theses at NTNU;2020:125, Doctoral thesis, 2020)
Since its discovery, silicon-based microelectromechanical systems (MEMS) have had a significant impact on the technological development of sensors and actuators. Using piezoelectric materials deposited as thin-films on a ...