Now showing items 82943-82962 of 100017

    • 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 and spin relaxation in odd-frequency superconductors 

      Johnsen, Lina G.; Linder, Jacob (Peer reviewed; Journal article, 2021)
      The spin transport inside an odd-frequency spin-triplet superconductor differs from that of a conventional superconductor due to its distinct symmetry properties. We study spin transport inside an emergent odd-frequency ...
    • 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 noise spectroscopy of rubidium atomic gas under resonant and non-resonant conditions 

      Ma, Jian; Shi, Ping; Qian, Xuan; Li, Wei; Ji, Yang (Journal article; Peer reviewed, 2016)
      The spin fluctuation in rubidium atom gas is studied via all-optical spin noise spectroscopy (SNS). Experimental results show that the integrated SNS signal and its full width at half maximum (FWHM) strongly depend on the ...
    • Spin orientation in solid solution hematite-ilmenite 

      Brok, Erik; Frandsen, Cathrine; Lefmann, Kim; McEnroe, Suzanne; Robinson, Peter; Burton, Benjamin P; Hansen, Thomas C; Harrison, Richard (Journal article; Peer reviewed, 2017)
      The spin orientation in synthetic hematite-ilmenite samples and in a sample of natural hematite was studied from room temperature to above the antiferromagnetic-paramagnetic phase transition (the Néel temperature; TN ≈ ...
    • Spin Polarization Effects in Cherenkov Radiation 

      Willadsen, Jonas Lundeby (Master thesis, 2018)
      Relativistic quantum mechanics is applied to calculate the transition amplitudes of Cherenkov radiation to first order in perturbation theory, for a spin polarized relativistic particle. Effects related to the spin ...
    • 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 a ferromagnetic insulator into an altermagnet 

      Sun, Chi; Linder, Jacob Wüsthoff (Journal article; Peer reviewed, 2023)
      A class of antiferromagnets with spin-polarized electron bands, yet zero net magnetization, called altermagnets, is attracting increasing attention due to their potential use in spintronics. Here, we study spin injection ...
    • Spin pumping from a ferromagnetic insulator to an unconventional superconductor with interfacial Andreev bound states 

      Sun, Chi; Linder, Jacob Wüsthoff (Journal article; Peer reviewed, 2023)
      Spin pumping from a ferromagnetic insulator into a high-Tc superconductor with a d-wave superconducting order parameter has recently been experimentally observed. Such unconventional superconducting order is known to ...
    • 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 in superconductor-antiferromagnetic insulator bilayers 

      Fyhn, Eirik Holm; Linder, Jacob (Peer reviewed; Journal article, 2021)
      We study theoretically spin pumping in bilayers consisting of superconductors (SC) and antiferromagnetic insulators (AFI). We consider both compensated and uncompensated interfaces and include both the regular scattering ...
    • 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 Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling 

      Linder, Jacob; Bathen, Marianne Etzelmüller (Journal article; Peer reviewed, 2017)
      We theoretically consider the spin Seebeck effect, the charge Seebeck coefficient, and the thermoelectric figure of merit in superconducting hybrid structures including either magnetic textures or intrinsic spin-orbit ...
    • Spin supercurrent and phase-tunable triplet Cooper pairs via magnetic insulators 

      Gomperud, Ingvild Ruud; Linder, Jacob (Journal article, 2015)
      We demonstrate theoretically that a dissipationless spin current can flow a long distance through a diffusive normal metal by using superconductors interfaced with magnetic insulators. The magnitude of this spin supercurrent ...
    • Spin supercurrent, magnetization dynamics, and φ -state in spin-textured Josephson junctions 

      Kulagina, Iryna; Linder, Jacob (Journal article, 2014)
      The prospect of combining the dissipationless nature of superconducting currents with the spin polarization of magnetic materials is interesting with respect to exploring superconducting analogs of topics in spintronics. ...
    • 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. ...