• A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory 

      Poudroux, Jean-Michael Yves (Master thesis, 2015)
      The magnetotelluric method is an electromagnetic induction method used to image subsurface resistivity. It utilizes Earths' natural time-varying electromagnetic field as a source. The fields propagating into the subsurface ...
    • A Study of Chemical Potential Influenced by Parametric Pumping of Antiferromagnetic Magnons 

      Varegg, Alexander Edin (Master thesis, 2019)
      Et blomstrende forskningsfelt i nyere tid omfatter Bose-Einstein kondensasjon (BEC) av magnoner i antiferromagneter. En lovende metode for å manipulere eksitasjon av magnoner er parametrisk parallell pumping (PPP). Ved å ...
    • Affect of Time Dependent Magnetization on SFS junctions: SFS, Josephson Current, Superconductor, Ferromagnetic, Time dependent field 

      Hedayatfar, Keivan (Master thesis, 2013)
      SFS junctions shows interesting properties, since these properties strongly related to geometry of device and current carriers status, one can control these properties with changing external conditions, such as changing ...
    • All-optical Magnetisation Switching in Two-dimensional Metallic Ferro- and Antiferromagnetic Systems 

      Krogen, Andreas Sandø (Master thesis, 2018)
      Motivated by recent experimental and theoretical work on ultrafast optical switching of magnetic order in ferromagnetic and antiferromagnetic materials, we study the influence of polarised light on the spin polarisation ...
    • Angle Resolved Relaxation of Spin Currents by Antiferromagnets in Spin Valves 

      Polishchuk, Dmytro; Kamra, Akashdeep; Polek, Taras; Brataas, Arne; Korenivski, Vladislav (Peer reviewed; Journal article, 2019)
      We observe and analyze tunable relaxation of a pure spin current by an antiferromagnet in spin valves. This is achieved by carefully controlling the angle between a resonantly excited ferromagnetic layer pumping the spin ...
    • Anisotropic and controllable Gilbert-Bloch dissipation in spin valves 

      Kamra, Akashdeep; Polishchuk, Dmytro; Korenivski, Vladislav; Brataas, Arne (Peer reviewed; Journal article, 2019)
      Spin valves form a key building block in a wide range of spintronic concepts and devices from magnetoresistive read heads to spin-transfer-torque oscillators. We elucidate the dependence of the magnetic damping in the free ...
    • Anisotropies and magnetic phase transitions in insulating antiferromagnets determined by a Spin-Hall magnetoresistance probe 

      Lebrun, Romain; Ross, Andrew; Gomonay, Olena; Bender, Scott A.; Baldrati, Lorenzo; Kronast, Florian; Qaiumzadeh, Alireza; Sinova, Jairo; Brataas, Arne; Duine, Rembert; Klaui, Mathias Michael (Journal article; Peer reviewed, 2019)
      Antiferromagnets possess a number of intriguing and promising properties for electronic devices, which include a vanishing net magnetic moment and thus insensitivity to large magnetic fields and characteristic terahertz ...
    • Antiferromagnetic Insulator Spintronics 

      Johansen, Øyvind (Doctoral theses at NTNU;2019:343, Doctoral thesis, 2019)
      Summary: Spin currents can make your computer energy efficient and ultrafast Have you noticed that your laptop sometimes can get quite warm? Electronical devices rely on transfer of information via a charge current ...
    • Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations 

      Kamra, Akashdeep; Thingstad, Even; Rastelli, Gianluca; Duine, Rembert A.; Brataas, Arne; Belzig, Wolfgang; Sudbø, Asle (Peer reviewed; Journal article, 2019)
      Employing the concept of two-mode squeezed states from quantum optics, we demonstrate a revealing physical picture for the antiferromagnetic ground state and excitations. Superimposed on a Néel ordered configuration, a ...
    • Backscattering in helical edge states from a magnetic impurity and Rashba disorder 

      Kimme, Lukas; Rosenow, Bernd; Brataas, Arne (Journal article; Peer reviewed, 2016)
      Transport by helical edge states of a quantum spin Hall insulator is experimentally characterized by a weakly temperature-dependent mean free path of a few microns and by reproducible conductance oscillations, challenging ...
    • Bose–Einstein condensation of nonequilibrium magnons in confined systems 

      Mohseni, Morteza; Qaiumzadeh, Alireza; Serga, Alexander; Brataas, Arne; Hillebrands, Burkard; Pirro, Philipp (Peer reviewed; Journal article, 2020)
      We study the formation of a room temperature magnon Bose–Einstein condensate (BEC) in nanoscopic systems and demonstrate that its lifetime is influenced by the spatial confinement. We predict how dipolar interactions and ...
    • Cavity-mediated impact of superconductors on ferromagnetic insulators 

      Janssønn, Andreas T. G. (Doctoral theses at NTNU;2022:254, Doctoral thesis, 2022)
      This dissertation is a presentation of the research conducted during three years at the QuSpin Center for Quantum Spintronics, on the cavity-mediation of interactions between ferromagnetic insulators (FI) and superconductors ...
    • Cavity-mediated superconductor–ferromagnetic-insulator coupling 

      Janssønn, Andreas T. G.; Hugdal, Henning G.; Brataas, Arne; Jacobsen, Sol H. (Peer reviewed; Journal article, 2023)
      A recent proof of concept showed that cavity photons can mediate superconducting (SC) signatures to a ferromagnetic insulator (FI) over a macroscopic distance [A. T. G. Janssønn et al., Phys. Rev. B 102, 180506(R) (2020)]. ...
    • Chiral ferromagnetism beyond Lifshitz invariants 

      Ado, I. A.; Qaiumzadeh, Alireza; Brataas, Arne; Titov, M. (Peer reviewed; Journal article, 2020)
      We consider a contribution w ch to the micromagnetic energy density that is linear with respect to the first spatial derivatives of the local magnetization direction. For a generalized two-dimensional Rashba ferromagnet, ...
    • Chiral Phonon Transport Induced by Topological Magnons 

      Thingstad, Even; Kamra, Akashdeep; Brataas, Arne; Sudbø, Asle (Peer reviewed; Journal article, 2019)
      The plethora of recent discoveries in the field of topological electronic insulators has inspired a search for boson systems with similar properties. There are predictions that ferromagnets on a two-dimensional honeycomb ...
    • Control of Magnon Condensates 

      Frostad, Therese (Doctoral theses at NTNU;2024:63, Doctoral thesis, 2024)
      Spintronics is a technology driven field aimed at harnessing the electron spin for novel devices. This is in contrast to traditional electronics, where the electron charge is used as an information carrier. Advances in ...
    • Current Control of Magnetism in Two-Dimensional Fe3GeTe2 

      Johansen, Øyvind; Risinggård, Vetle Kjær; Sudbø, Asle; Linder, Jacob; Brataas, Arne (Journal article; Peer reviewed, 2019)
      The recent discovery of magnetism in two-dimensional van der Waals systems opens the door to discovering exciting physics. We investigate how a current can control the ferromagnetic properties of such materials. Using ...
    • Current-Driven Dynamics of Magnetic Hopfions 

      Wang, Xiansi; Qaiumzadeh, Alireza; Brataas, Arne (Journal article; Peer reviewed, 2019)
      opological magnetic textures have attracted considerable interest since they exhibit new properties and might be useful in information technology. Magnetic hopfions are three-dimensional (3D) spatial variations in the ...
    • Current-driven skyrmion depinning in magnetic granular films 

      Salimath, A; Abbout, A; Brataas, Arne; Manchon, A (Peer reviewed; Journal article, 2019)
      We consider current-driven motion of magnetic skyrmions in granular magnetic films. The study uses micromagnetic modeling and phenomenological analysis based on the Thiele formalism. Remarkably, the disorder enhances the ...
    • Detection of Topological Spin Textures via Nonlinear Magnetic Responses 

      Stepanova, Mariia; Masell, Jan; Lysne, Erik Nikolai; Schoenherr, Peggy; Köhler, Laura; Paulsen, Michael; Qaiumzadeh Javinani, Alireza; Kanazawa, Naoya; Rosch, Achim; Tokura, Yoshinori; Brataas, Arne; Garst, Markus; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2021)
      Topologically nontrivial spin textures, such as skyrmions and dislocations, display emergent electrodynamics and can be moved by spin currents over macroscopic distances. These unique properties and their nanoscale size ...