• 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 ...
    • 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 ...
    • 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 ...
    • Electrically driven Bose-Einstein condensation of magnons in antiferromagnets 

      Fjærbu, Eirik Løhaugen; Rohling, Niklas; Brataas, Arne (Journal article; Peer reviewed, 2017)
      We explore routes to realize electrically driven Bose-Einstein condensation of magnons in insulating antiferromagnets. Even in insulating antiferromagnets, the localized spins can strongly couple to itinerant spins in ...
    • Enhanced Spin Conductance of a Thin-Film Insulating Antiferromagnet 

      Bender, Scott A.; Skarsvåg, Hans Langva; Brataas, Arne; Duine, R A (Journal article; Peer reviewed, 2017)
      We investigate spin transport by thermally excited spin waves in an antiferromagnetic insulator. Starting from a stochastic Landau-Lifshitz-Gilbert phenomenology, we obtain the out-of-equilibrium spin-wave properties. In ...
    • Enhancement of superconductivity mediated by antiferromagnetic squeezed magnons 

      Erlandsen, Eirik; Kamra, Akashdeep; Brataas, Arne; Sudbø, Asle (Journal article; Peer reviewed, 2019)
      We theoretically investigate magnon-mediated superconductivity in a heterostructure consisting of a normal metal and a two-sublattice antiferromagnetic insulator. The attractive electron-electron pairing interaction is ...
    • Equations of motion and frequency dependence of magnon-induced domain wall motion 

      Risinggård, Vetle Kjær; Tveten, Erlend Grytli; Brataas, Arne; Linder, Jacob (Journal article; Peer reviewed, 2017)
      Spin waves can induce domain wall motion in ferromagnets. We derive the equations of motion for a transverse domain wall driven by spin waves. Our calculations show that the magnonic spin-transfer torque does not cause ...
    • Intrinsic magnetization of antiferromagnetic textures 

      Tveten, Erlend Grytli; Muller, Tristan; Linder, Jacob; Brataas, Arne (Journal article, 2016)
      Antiferromagnets (AFMs) exhibit intrinsic magnetization when the order parameter spatially varies. This intrinsic spin is present even at equilibrium and can be interpreted as a twisting of the homogeneous AFM into a state ...