Blar i NTNU Open på forfatter "Brataas, Arne"

Viser treff 81-95 av 95

    • Strong bulk spin-orbit torques quantified in the van der Waals ferromagnet Fe3GeTe2 

      Martin, F; Lee, K; Schmitt, M; Liedtke, A; Shahee, A; Simensen, Haakon Thømt; Scholz, T; Saundersen, T; Go, Dongwook; Gradhand, M; Denneulin, Thibaud; Kovacs, A; Lotsch, Bettina V.; Brataas, Arne; Klaeui, Mathias (Peer reviewed; Journal article, 2023)
      The recent emergence of magnetic van der Waals materials allows for the investigation of current-induced magnetisation manipulation in two-dimensional materials. Uniquely, Fe3GeTe2 has a crystalline structure that allows ...

    • Subterahertz spin pumping from an insulating antiferromagnet 

      Vaidya, Priyanka; Morley, Sophie A.; van Tol, Johan; Liu, Yan; Cheng, Ran; Brataas, Arne; Lederman, David; del Barco, Enrique (Peer reviewed; Journal article, 2020)
      Spin-transfer torque and spin Hall effects combined with their reciprocal phenomena, spin pumping and inverse spin Hall effects (ISHEs), enable the reading and control of magnetic moments in spintronics. The direct observation ...

    • Superconducting Proximity Effect and Long-Ranged Triplets in Dirty Metallic Antiferromagnets 

      Fyhn, Eirik Holm; Brataas, Arne; Qaiumzadeh, Alireza; Linder, Jacob Wüsthoff (Journal article; Peer reviewed, 2023)
      Antiferromagnets have no net spin splitting on the scale of the superconducting coherence length. Despite this, antiferromagnets have been observed to suppress superconductivity in a similar way as ferromagnets, a phenomenon ...

    • Superconductivity at metal-antiferromagnetic insulator interfaces 

      Fjærbu, Eirik Løhaugen; Rohling, Niklas; Brataas, Arne (Peer reviewed; Journal article, 2019)
      Magnons in antiferromagnetic insulators couple strongly to conduction electrons in adjacent metals. We show that this interfacial tie can lead to superconductivity in a trilayer consisting of a metal sandwiched between two ...

    • Superconductivity induced by interfacial coupling to magnons 

      Rohling, Niklas; Fjærbu, Eirik Løhaugen; Brataas, Arne (Journal article; Peer reviewed, 2018)
      We consider a thin normal metal sandwiched between two ferromagnetic insulators. At the interfaces, the exchange coupling causes electrons within the metal to interact with magnons in the insulators. This electron-magnon ...

    • Terahertz Antiferromagnetic Spin Hall Nano-Oscillator 

      Cheng, Ran; Xiao, Di; Brataas, Arne (Journal article; Peer reviewed, 2016)
      We consider the current-induced dynamics of insulating antiferromagnets in a spin Hall geometry. Sufficiently large in-plane currents perpendicular to the Néel order trigger spontaneous oscillations at frequencies between ...

    • Theory of Antisymmetric Exchange in Metallic Antiferromagnetic Thin Films 

      Hanslin, Sander Øglænd (Master thesis, 2019)
      Den antisymmetriske Dzyaloshinskii-Moriya interaksjonen (DMI) er viktig for stabilisering av ikke-kollineære magnetiske faser. Ved å sammenligne uttrykket for mikromagnetisk fri energi med den feltteoretiske partisjonsfunksjonen, ...

    • Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators 

      Shiranzaei, Mahroo; Troncoso, Roberto; Fransson, Jonas; Brataas, Arne; Qaiumzadeh, Alireza (Peer reviewed; Journal article, 2022)
      We investigate the effect of magnon–magnon interactions on the dispersion and polarization of magnon modes in collinear antiferromagnetic (AF) insulators at finite temperatures. In two-sublattice AF systems with uniaxial ...

    • Thermoelectric Properties of (Anti)ferromagnet - Superconductor Hybrid Junctions 

      Naess, Kristian (Master thesis, 2019)
      Denne masteroppgaven undersøker de termiske egenskapene til både en ferromagnet-superleder overgang og en antiferromagnet-superleder overgang. Målet med oppgaven er å utlede, grafisk fremstille og evaluere termisk ledningsevne, ...

    • Transport in Magnetic and Superconducting Heterostructures 

      Jakobsen, Martin Fonnum (Doctoral theses at NTNU;2021:374, Doctoral thesis, 2021)
      In essence, spintronics aims to utilize the spins of electrons to store and process information, either as a supplement to or as a replacement for electron charges. Electron spins are particularly suitable for use in ...

    • Two-dimensional altermagnets: Superconductivity in a minimal microscopic model 

      Brekke, Bjørnulf; Brataas, Arne; Sudbø, Asle (Peer reviewed; Journal article, 2023)
      We propose a minimal toy model for a two-dimensional altermagnet. The model unravels altermagnetic properties at a microscopic level. We find spin-split electron and nondegenerate magnon bands with a d -wave symmetry. We ...

    • Ultrafast control of spin interactions in honeycomb antiferromagnetic insulators 

      Losada, Juan Manuel; Brataas, Arne; Qaiumzadeh, Alireza (Journal article; Peer reviewed, 2019)
      Light enables the ultrafast, direct, and nonthermal control of the exchange and Dzyaloshinskii-Moriya interactions. We consider two-dimensional honeycomb lattices described by the Kane-Mele-Hubbard model at half filling ...

    • Ultrafast generation and dynamics of isolated skyrmions in antiferromagnetic insulators 

      Khoshlahni, Rohollah; Qaiumzadeh, Alireza; Bergman, Anders; Brataas, Arne (Peer reviewed; Journal article, 2019)
      Based on atomistic spin dynamics simulations, we report the ultrafast generation of single antiferromagnetic (AFM) skyrmions in a confined geometry. This process is achieved through an effective magnetic field induced by ...

    • Ultrafast manipulation of Heisenberg exchange and Dzyaloshinskii–Moriya interactions in antiferromagnetic insulators 

      Losada, Juan Manuel (Master thesis, 2019)
      Light enables ultrafast, direct and nonthermal control of the exchange and Dzyaloshinskii-Moriya interactions. We consider two-dimensional honeycomb lattices described by the Kane-Mele-Hubbard model at half filling and in ...

    • Universal Scaling Theory of the Boundary Geometric Tensor in Disordered Metals 

      Werner, Miklos Antal; Brataas, Arne; von Oppen, Felix; Zarand, Gergely (Peer reviewed; Journal article, 2019)
      We investigate the finite-size scaling of the boundary quantum geometric tensor (QGT) numerically close to the Anderson localization transition in the presence of small external magnetic fields. The QGT exhibits universal ...