Blar i NTNU Open på forfatter "Johansen, Øyvind"

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    • 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 ...

    • Argumentasjon og resonnering i arbeid med spill 

      Johansen, Øyvind (Master thesis, 2023)
      I denne studien har jeg undersøkt om hvordan elever i 1.trinn jobber i arbeid med spill innenfor matematikk. Formålet med dette er å undersøke om spill kan åpne opp for elevers argumentasjon og resonnering rundt arbeid med ...

    • 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 spin–orbit torque oscillator: ferromagnetic and antiferromagnetic coupling 

      Johansen, Øyvind; Linder, Jacob (Peer reviewed; Journal article, 2016)
      We consider theoretically the impact of Rashba spin–orbit coupling on spin torque oscillators (STOs) in synthetic ferromagnets and antiferromagnets that have either a bulk multilayer or a thin film structure. The synthetic ...

    • Electric Control of Skyrmion Dynamics and Spin Torque Oscillators in Magnetic Materials with Inversion Asymmetry 

      Johansen, Øyvind (Master thesis, 2016)
      In this thesis the skyrmion velocity in the presence of spin-transfer torques, Rashba spin-orbit coupling and a constant electric field gradient is derived analytically based on a collective coordinate approach in 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 ...

    • 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 ...

    • 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-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 ...