• Magnetization dynamics in ferromagnetic, antiferromagnetic and superconducting systems 

      Simensen, Haakon Thømt (Doctoral theses at NTNU;2021:197, Doctoral thesis, 2021)
      The electron spin is an intrinsic property of the electron, just as its charge. Its spin is binary of nature, and is therefore well suited for encoding 0’s and 1’s in computers. The technology aiming to utilize the electron ...
    • Magnon decay theory of Gilbert damping in metallic antiferromagnets 

      Simensen, Haakon Thømt; Kamra, Akashdeep; Troncoso, Roberto; Brataas, Arne (Peer reviewed; Journal article, 2020)
      Gilbert damping is a key property governing magnetization dynamics in ordered magnets. We present a theoretical study of intrinsic Gilbert damping induced by magnon decay in antiferromagnetic metals through s−d exchange ...
    • Magnon Spin Current Induced by Triplet Cooper Pair Supercurrents 

      Johnsen, Lina G.; Simensen, Haakon Thømt; Brataas, Arne; Linder, Jacob (Peer reviewed; Journal article, 2021)
      At the interface between a ferromagnetic insulator and a superconductor there is a coupling between the spins of the two materials. We show that when a supercurrent carried by triplet Cooper pairs flows through the ...
    • Magnon-polarons in cubic collinear antiferromagnets 

      Simensen, Haakon Thømt; Troncoso, Roberto; Kamra, Akashdeep; Brataas, Arne (Peer reviewed; Journal article, 2019)
      We present a theoretical study of excitations formed by hybridization between magnons and phonons—magnon-polarons—in antiferromagnets. We first outline a general approach to determining which magnon and phonon modes can ...
    • Proximity effect in ballistic superconductor-ferromagnet structures with spin-orbit coupling 

      Simensen, Haakon Thømt (Master thesis, 2017)
      The Bogoliubov-de Gennes equations have been solved numerically for a number of two-dimensional ballistic proximity structures comprised of superconductors, normal metals and ferromagnets, with both interfacial and in-plane ...
    • 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 ...
    • Tunable superconducting critical temperature in ballistic hybrid structures with strong spin-orbit coupling 

      Simensen, Haakon Thømt; Linder, Jacob (Journal article; Peer reviewed, 2018)
      We present a theoretical description and numerical simulations of the superconducting transition in hybrid structures including strong spin-orbit interactions. The spin-orbit coupling is taken to be of Rashba type for ...