Blar i NTNU Open på forfatter "Brataas, Arne"
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Magnetization dynamics in nanostructures
Flovik, Vegard (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. ... -
Magnon decay theory of Gilbert damping in metallic antiferromagnets
Simensen, Haakon Thømt; Kamra, Akashdeep; Troncoso, Roberto; Brataas, Arne (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 Excitations of a Dzyaloshinskii-Moriya Coupled Insulating 2D Antiferromagnetic Skyrmion
Sørheim, Sondre Bergem (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
Johnsen, Lina G.; Simensen, Haakon Thømt; Brataas, Arne; Linder, Jacob (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
Johansen, Øyvind; Kamra, Akashdeep; Ulloa, Camilo; Brataas, Arne; Duine, Rembert (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 on the surface of a topological insulator
Erlandsen, Eirik; Brataas, Arne; Sudbø, Asle (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-polarons in cubic collinear antiferromagnets
Simensen, Haakon Thømt; Troncoso, Roberto; Kamra, Akashdeep; Brataas, Arne (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 ... -
Manipulating Spins in Antiferromagnets with External Forces
Tveten, Erlend Grytli (Doctoral thesis at NTNU;2016:114, Doctoral thesis, 2016)This thesis presents five papers on theoretical spintronics. Four of the papers describe antiferromagnets and the interactions between the magnetic order parameter and external forces induced by charge currents, spin ... -
Micromagnetic study of spin transport in easy-plane antiferromagnetic insulators
Brehm, Verena Johanna; Gomonay, Olena; Lepadatu, Serban; Klaüi, Mathias; Sinova, Jairo; Brataas, Arne; Qaiumzadeh, Alireza (Journal article; Peer reviewed, 2023) -
Noise and dissipation in magnetoelectronic nanostructures
Foros, Jørn (Doctoral Theses at NTNU, 1503-8181; 2008:112, Doctoral thesis, 2008)This thesis adresses electric and magnetic noise and dissipation in magnetoelectronic nanostructures. Charge and spin current fluctuations are studied in various nanosized metallic structures consisting of both ferromagnetic ... -
Nonlocal Coupling between Antiferromagnets and Ferromagnets in Cavities
Johansen, Øyvind; Brataas, Arne (Journal article; Peer reviewed, 2018)Microwaves couple to magnetic moments in both ferromagnets and antiferromagnets. Although the magnons in ferromagnets and antiferromagnets radically differ, they can become entangled via strong coupling to the same microwave ... -
Normal and superfluid spin dynamics in magnetic insulator heterostructures
Skarsvåg, Hans Langva (Doctoral theses at NTNU;2016:334, Doctoral thesis, 2016)Summary of thesis: Normal and superfluid spin dynamics in magnetic insulator heterostructures In this thesis, the results of six research papers on spintronics-related effects are presented. The main focus is on ... -
Novel Topological Spin Solitons for Spintronics Applications
Lysne, Erik (Doctoral theses at NTNU;2021:227, Doctoral thesis, 2021)Topologically non-trivial spin solitons, such as skyrmions and magnetic edge dislocations, are particle-like nanoscale configurations in the magnetization field. In solid state systems, they can be written, moved, and ... -
Optical conversion of pure spin currents in hybrid molecular devices
Wheeler, May C; Ma'Mari, Fatma Al; Rogers, Matthew; Goncalves, Francisco J; Moorsom, Timothy; Brataas, Arne; Stamps, Robert; Ali, Mannan; Burnell, Gavin; Hickey, BJ; Cespedes, Oscar (Journal article; Peer reviewed, 2017)Carbon-based molecules offer unparalleled potential for THz and optical devices controlled by pure spin currents: a low-dissipation flow of electronic spins with no net charge displacement. However, the research so far has ... -
Phenomenology of current-induced skyrmion motion in antiferromagnets
Velkov, H; Gomonay, O; Beens, M; Schwiete, G; Brataas, Arne; Sinova, J; Duine, R A (Journal article; Peer reviewed, 2016)We study current-driven skyrmion motion in uniaxial thin film antiferromagnets in the presence of the Dzyaloshinskii–Moriya interactions and in an external magnetic field. We phenomenologically include relaxation and ... -
Propagation Length of Antiferromagnetic Magnons Governed by Domain Configurations
Ross, Andrew; Lebrun, Romain; Gomonay, Olena; Grave, Daniel A.; Kay, Asaf; Baldrati, Lorenzo; Becker, Sven; Qaiumzadeh, Alireza; Ulloa, Camilo; Jakob, Gerhard; Kronast, Florian; Sinova, Jairo; Duine, Rembert; Brataas, Arne; Rothschild, Avner; Klaui, Mathias Michael (Peer reviewed; Journal article, 2019)The compensated magnetic order and characteristic terahertz frequencies of antiferromagnetic materials make them promising candidates to develop a new class of robust, ultrafast spintronic devices. The manipulation of ... -
Quantum Phenomena at Magnetic Insulator-Normal Metal Interfaces
Fjærbu, Eirik Løhaugen (Doctoral theses at NTNU;2018:249, Doctoral thesis, 2018)Electrons carry an intrinsic angular momentum that we call spin. Spintronics is a field of research which aims to create new computer technology by making use of the electron spin. This thesis presents the results of four ... -
Quasiclassical theory for antiferromagnetic metals
Fyhn, Eirik Holm; Brataas, Arne; Qaiumzadeh, Alireza; Linder, Jacob Wüsthoff (Peer reviewed; Journal article, 2023)Unlike ferromagnetism, antiferromagnetism cannot readily be included in the quasiclassical Keldysh theory because of the rapid spatial variation in the directions of of the magnetic moments. The quasiclassical framework ... -
Renormalised Intrinsic and Extrinsic Impurity Induced Spin-orbit Scattering in Graphene
Gislesen, Halvor; Skarsvåg, Hans (Master thesis, 2012)We study the effect of an impurity potential on spin-memory loss in graphene. Various general methods for finding the spin-orbit related effect of a slowly varying impurity potential on a semiconductor have been examined. ... -
Scattering theory of transport through disordered magnets
Jakobsen, Martin Fonnum; Qaiumzadeh, Alireza; Brataas, Arne (Journal article; Peer reviewed, 2019)We present a scattering theory of transport through noncollinear disordered magnetic insulators. For concreteness, we study and compare the random field model (RFM) and the random anisotropy model (RAM). The RFM and RAM ...