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Magnetization Dynamics and Spinsupercurrents in Superconductingand Multiferroic Systems
(Doctoral thesis at NTNU;2016:5, Doctoral thesis, 2016)This thesis presents the research findings from three articles which have been published or submitted for publication. In the first article, we study the magnetization dynamics and anomalous supercurrent that can arise ... -
Magnetization dynamics in ferromagnetic, antiferromagnetic and superconducting systems
(Doctoral theses at NTNU;2021:197, Doctoral thesis, 2021)The electron spin is an intrinsic property of the electron, just as its charge. Its spin is binary of nature, and is therefore well suited for encoding 0’s and 1’s in computers. The technology aiming to utilize the electron ... -
Magnetization dynamics in nanostructures
(Doctoral theses at NTNU;2016:360, Doctoral thesis, 2016)Summary of thesis: Understanding the properties of magnetic structures when confined to nanoscale dimensions is of both fundamental interest, as well as of importance for the development of modern electronics technology. ... -
Magnetization dynamics of a ferromagnet embedded in a Josephson junction with a spin-orbit coupled element
(Master thesis, 2018)We investigate the free energy of Andreev bound states (ABS) in a Josephson junction containing a ferromagnet and an element where broken inversion symmetry produces Rashba spin-orbit coupling. Applying an extended ... -
Magnetization reorientation due to the superconducting transition in heavy-metal heterostructures
(Journal article; Peer reviewed, 2019)Recent theoretical and experimental work has demonstrated how the superconducting critical temperature (Tc) can be modified by rotating the magnetization of a single homogeneous ferromagnet proximity-coupled to the ... -
Magneto-dynamic properties of complex oxide—La0.7Sr0.3MnO3/SrTiO3— heterostructure interface
(Journal article; Peer reviewed, 2019)We have studied the interface magnetodynamic properties of La0.7Sr0.3MnO3/SrTiO3 (111) heterostructures by Ferromagnetic resonance spectroscopy (FMR). In addition to the bulk FMR mode, the measurements indicate a mode ... -
Magneto-dynamic properties of thin films and interfaces
(Doctoral theses at NTNU;2020:278, Doctoral thesis, 2020)Magnonics is a developing branch in the field of condensed matter physics with the potential to fulfill the future demand for miniaturized, fast, and energy-efficient spintronics devices. This thesis explores both a novel ... -
Magnetodynamic properties of dipole-coupled 1D magnonic crystals
(Journal article, 2021)Magnonic crystals are magnetic metamaterials, that provide a promising way to manipulate magnetodynamic properties by controlling the geometry of the patterned structures. Here, we study the magnetodynamic properties of ... -
Magnon Condensation of Magnetic Insulators
(Master thesis, 2023)Bose-Einstein kondensasjon er et forskningsfelt som har fått økt oppmerksomhet etter at Ketterle et al. og Cornell et al., i 1995, fremstilte et kondensat for første gang. Begge gruppene laget kondensatet av reelle ... -
Magnon decay theory of Gilbert damping in metallic antiferromagnets
(Peer reviewed; Journal article, 2020)Gilbert damping is a key property governing magnetization dynamics in ordered magnets. We present a theoretical study of intrinsic Gilbert damping induced by magnon decay in antiferromagnetic metals through s−d exchange ... -
Magnon drag in a metal–insulating antiferromagnet bilayer
(Peer reviewed; Journal article, 2022)We study a bilayer structure consisting of an antiferromagnetic insulator and a normal metal. An electron current is driven in the normal metal with direction parallel to the interface between the materials. Due to interfacial ... -
Magnon Excitations of a Dzyaloshinskii-Moriya Coupled Insulating 2D Antiferromagnetic Skyrmion
(Master thesis, 2018)Motivated by recent experimental progress in realizing novel antiferromagnetic phases with state-of-the-art characteristics for memory storage and information processing, we study the magnon excitation spectra and eigenmodes ... -
Magnon Spin Current Induced by Triplet Cooper Pair Supercurrents
(Peer reviewed; Journal article, 2021)At the interface between a ferromagnetic insulator and a superconductor there is a coupling between the spins of the two materials. We show that when a supercurrent carried by triplet Cooper pairs flows through the ... -
Magnon-Mediated Indirect Exciton Condensation through Antiferromagnetic Insulators
(Journal article; Peer reviewed, 2019)Electrons and holes residing on the opposing sides of an insulating barrier and experiencing an attractive Coulomb interaction can spontaneously form a coherent state known as an indirect exciton condensate. We study a ... -
Magnon-mediated superconductivity and other collective phenomena in heterostructures of magnets and conductors
(Doctoral theses at NTNU;2022:269, Doctoral thesis, 2022)Sammendrag: Superledning fra magnetisme Når ulike typer materialer kobles sammen, kan deres egenskaper bli påvirket av hverandre. Spesielt i nærheten av overflaten mellom to ulike materialer, kan nye ting skje. ... -
Magnon-mediated superconductivity on the surface of a topological insulator
(Journal article; Peer reviewed, 2020)We study superconductivity on the surface of a topological insulator, mediated by magnetic fluctuations in an adjacent ferromagnetic or antiferromagnetic insulator. Superconductivity can arise from effective interactions ... -
Magnon-Mediated Superconductivity: Investigating the Emergence of Strong Topological Superconductivity Mediated by Magnons in a Coplanar, Non-Collinear Magnet
(Master thesis, 2023)Denne masteroppgaven undersøker hvorvidt topologisk superledning kan oppstå i et todimensjonalt system bestående av et normalmetall og en magnet med koplanær spinnfase. Vi bygger videre på arbeidet til Mæland og Sudbø [1], ... -
Magnon-polarons in cubic collinear antiferromagnets
(Peer reviewed; Journal article, 2019)We present a theoretical study of excitations formed by hybridization between magnons and phonons—magnon-polarons—in antiferromagnets. We first outline a general approach to determining which magnon and phonon modes can ... -
Magnus Expansion in Gauge Theories
(Master thesis, 2022)Noen uttrykk for løsningen på en ordinær differensiallikning utledes ved hjelp av en metode som innebærer Taylor-rekkeutvikling av vektorfeltet som definerer differensiallikningen. En generalisering av et kjent resultat ... -
Majorana fermions in spin-orbit-coupled ferromagnetic Josephson junctions
(Journal article; Peer reviewed, 2011)We study all possible Majorana modes in two-dimensional spin-orbit-coupled ferromagnetic superconductor–normal state–superconductor (SNS) Josephson junctions and propose experiments to detect them. With the S region in a ...