Blar i NTNU Open på forfatter "Brataas, Arne"

Viser treff 61-80 av 95

    • Spin currents and torques via magnons, electrons, and Cooper pairs 

      Risinggård, Vetle Kjær (Doctoral theses at NTNU;2019:224, Doctoral thesis, 2019)
      Spin-based electronics—spintronics—is a candidate technology for complementing or replacing traditional semiconductor electronics at the end of Moore's law. We consider different spin carriers—electrons, magnons, and Cooper ...

    • Spin dynamics in magnetic structures: A numerical study 

      Wirak, Mette (Master thesis, 2019)
      Spintronikk foreslår en alterativ måte å gjøre datalagring på, som vil kunne være både mer effektiv og raskere. Grunnlaget for forskningsfeltet er den kvantemekaniske egenskapen spinn, som gjennom spinnbølger kan forflyttes ...

    • Spin Hall effect and spin swapping in diffusive superconductors 

      Espedal, Camilla; Lange, Peter; Sadjina, Severin Simon; Mal'Shukov, Anatoly Germanovich; Brataas, Arne (Journal article; Peer reviewed, 2017)
      We consider the spin-orbit-induced spin Hall effect and spin swapping in diffusive superconductors. By employing the nonequilibrium Keldysh Green's function technique in the quasiclassical approximation, we derive coupled ...

    • Spin injection in quantum wells with spatially dependent rashba interaction 

      Brataas, Arne; Malshukov, Anatolii; Tserkovnyak, Y (Journal article; Peer reviewed, 2007)
      We consider Rashba spin–orbit effects on spin transport driven by an electric field in semiconductor quantum wells. We derive spin diffusion equations that are valid when the mean free path and the Rashba spin–orbit interaction ...

    • Spin pumping and inverse spin Hall voltages from dynamical antiferromagnets 

      Johansen, Øyvind; Brataas, Arne (Journal article; Peer reviewed, 2017)
      Dynamical antiferromagnets can pump spins into adjacent conductors. The high antiferromagnetic resonance frequencies represent a challenge for experimental detection, but magnetic fields can reduce these resonance frequencies. ...

    • Spin pumping between noncollinear ferromagnetic insulators through thin superconductors 

      Simensen, Haakon Thømt; Johnsen, Lina G.; Linder, Jacob; Brataas, Arne (Peer reviewed; Journal article, 2021)
      Dynamical magnets can pump spin currents into superconductors. To understand such a phenomenon, we develop a method utilizing the generalized Usadel equation to describe time-dependent situations in superconductors in ...

    • Spin Pumping from Uniform, Non-collinear Antiferromagnets 

      Lund, Mike Alexander (Master thesis, 2019)
      Motivert av nylig teoretisk arbeid med spin pumping i to-subgitter magneter vil vi undersøke effekten av kryss-subgitter spin pumping på den totale dc spin pumpestrømmen pumpet fra en antiferromagnet, og om dette kan bli ...

    • Spin pumping, dissipation, and direct and alternating inverse spin Hall effects in magnetic-insulator/normal-metal bilayers 

      Kapelrud, Andre; Brataas, Arne (Journal article; Peer reviewed, 2017)
      We theoretically consider the spin-wave mode- and wavelength-dependent enhancement of the Gilbert damping in magnetic insulator–normal metal bilayers due to spin pumping as well as the enhancement's relation to direct and ...

    • Spin pumping, spin transfer, and spin Hall effects in magnetic insulator-normal metal systems 

      Kapelrud, André (Doctoral theses at NTNU;2017:220, Doctoral thesis, 2017)
      This thesis presents four research papers on two topics within the field of spintronics. Three of the papers present theoretical models concerned with the topics of spin wave mode-dependent spin pumping, spin transfer, and ...

    • Spin Superfluidity in Biaxial Antiferromagnetic Insulators 

      Qaiumzadeh, Alireza; Skarsvåg, Hans Langva; Holmqvist, Cecilia; Brataas, Arne (Journal article; Peer reviewed, 2017)
      Antiferromagnets may exhibit spin superfluidity since the dipole interaction is weak. We seek to establish that this phenomenon occurs in insulators such as NiO, which is a good spin conductor according to previous studies. ...

    • Spin Transport in a Finite-Depth Antiferromagnetic Insulator - Metallic Conductor Bilayer System with a Distinct Antiferromagnetic Surface Spin Exchange 

      Flaten, Jonas Boym (Master thesis, 2018)
      A currently increasing interest in antiferromagnetic insulator spintronics, due to emergent attractive properties such as terahertz operation and spin transport enhancement, encourages theoretical investigation on the ...

    • Spin Transport in Antiferromagnets and Ferromagnets 

      Gulbrandsen, Sverre Aamodt (Doctoral theses at NTNU;2020:242, Doctoral thesis, 2020)
      This doctoral thesis presents and supplements the results of three scientific papers [1,2,3] within the field of theoretical condensed matter physics. The three papers investigate several spin-related phenomena in ...

    • Spin Wave Modulation in Antiferromagnetic Magnonic Crystals with Interfacial Dzyaloshinskii-Moriya Interaction 

      Pedersen, Håkon (Master thesis, 2019)
      Framveksten av fagområdet spinntronikk har åpnet et nytt, interessant felt i fysikken fra både teoretisk og teknologisk ståsted. Motivert av muligheten for nye måter å sende, prosessere og lagre informasjon, samt nylige ...

    • Spin-Motive Forces and Coulomb Interaction in a Ferromagnetic Wire 

      Gulbrandsen, Sverre Aamodt (Master thesis, 2015)
      In metallic ferromagnets, external voltages induce charge and spin-polarized currents. Additionally, there can be magnetization dynamics, where the magnetic moments precess in time in response to external magnetic fields. ...

    • Spin-Motive Forces and Electron-Electron Interactions 

      Rist, Snorre (Master thesis, 2014)
      In this thesis, the spin-motive force, a spin-dependent force arising due to magnetization dynamics in an inhomogenous magnetic system, is investigated. We consider how spin-currents, arising from the spin dependent force, ...

    • Spin-orbit-induced dynamics of magnetic textures 

      Kristiansen, Lars André (Master thesis, 2017)
      We investigate the effect of the relativistic spin-orbit interaction on the dynamics of both ferromagnetic and antiferromagnetic domain walls driven by spin waves. Initially, we derive the free energy and the equations of ...

    • Spin-Orbit-Induced Electronic Phenomena in Superconductors and Antiferromagnets 

      Espedal, Camilla (Doctoral theses at NTNU;2017:362, Doctoral thesis, 2017)
      In this thesis, we present three scientific papers that are all related to electronic phenomena induced by spin-orbit coupling. Papers 1 and 2 concern spin-orbit induced effects in superconductors and Paper 3 treats similar ...

    • Spin-Transfer and Exchange Torques in Ferromagnetic Superconductors 

      Linder, Jacob; Brataas, Arne; Shomali, Zahra; Zareyan, Malek (Journal article; Peer reviewed, 2012)
      We consider how superconducting correlations influence spin-transfer torques in ferromagnetic superconductors. It is demonstrated that there is a novel torque arising from particle-hole interference that depends on the ...

    • Spin-transfer antiferromagnetic resonance 

      Johansen, Øyvind; Skarsvåg, Hans Langva; Brataas, Arne (Journal article; Peer reviewed, 2018)
      Currents can induce spin excitations in antiferromagnets, even when they are insulating. We investigate how spin transfer can cause antiferromagnetic resonance in bilayers and trilayers that consist of one antiferromagnetic ...

    • Static and Dynamic Transport Properties in Superconductors, Normal Metals and Ferromagnets 

      Espedal, Camilla (Master thesis, 2013)
      In this thesis we consider transport properties in different hybrid nanostructures, consisting of normal metals, ferromagnets and superconductors. We investigate the thermal distribution of bound Andreev states, and use ...