Nye registreringer

  • Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations 

    Kamra, Akashdeep; Thingstad, Even; Rastelli, Gianluca; Duine, Rembert A.; Brataas, Arne; Belzig, Wolfgang; Sudbø, Asle (Peer reviewed; Journal article, 2019)
    Employing the concept of two-mode squeezed states from quantum optics, we demonstrate a revealing physical picture for the antiferromagnetic ground state and excitations. Superimposed on a Néel ordered configuration, a ...
  • Spin current cross-correlations as a probe of magnon coherence 

    Bender, Scott A.; Kamra, Akashdeep; Belzig, Wolfgang; Duine, Rembert (Peer reviewed; Journal article, 2019)
    Motivated by the important role of the normalized second-order coherence function, often called g(2), in the field of quantum optics, we propose a method to determine magnon coherence in solid-state devices. Namely, we ...
  • 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 ...
  • Anisotropic and controllable Gilbert-Bloch dissipation in spin valves 

    Kamra, Akashdeep; Polishchuk, Dmytro; Korenivski, Vladislav; Brataas, Arne (Peer reviewed; Journal article, 2019)
    Spin valves form a key building block in a wide range of spintronic concepts and devices from magnetoresistive read heads to spin-transfer-torque oscillators. We elucidate the dependence of the magnetic damping in the free ...
  • Angle Resolved Relaxation of Spin Currents by Antiferromagnets in Spin Valves 

    Polishchuk, Dmytro; Kamra, Akashdeep; Polek, Taras; Brataas, Arne; Korenivski, Vladislav (Peer reviewed; Journal article, 2019)
    We observe and analyze tunable relaxation of a pure spin current by an antiferromagnet in spin valves. This is achieved by carefully controlling the angle between a resonantly excited ferromagnetic layer pumping the spin ...
  • Exchange-enhanced ultrastrong magnon-magnon coupling in a compensated ferrimagnet 

    Liensberger, Lukas; Kamra, Akashdeep; Maier-Flaig, Hannes; Gepraegs, Stephan; Erb, Andreas; Goennenwein, Sebastian; Gross, Rudolf; Belzig, Wolfgang; Huebl, Hans; Weiler, Mathias (Peer reviewed; Journal article, 2019)
    We experimentally study the spin dynamics in a gadolinium iron garnet single crystal using broadband ferromagnetic resonance. Close to the ferrimagnetic compensation temperature, we observe ultrastrong coupling of clockwise ...
  • Revealing the Heterogeneous Nucleation and Growth Behaviour of Grains in Inoculated Aluminium Alloys During Solidification 

    Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun (Peer reviewed; Journal article, 2019)
    An in situ X-ray radiographic study on the grain nucleation and grain growth of inoculated Al–10Cu and Al–20Cu alloys during isothermal melt solidification and directional solidification conditions with constant cooling ...
  • High-energy X-ray Tomography for 3D Void Characterization in Au–Sn Solid-Liquid Interdiffusion (SLID) Bonds 

    Aasmundtveit, Knut; Tekseth, Kim Robert Bjørk; Breiby, Dag Werner; Nguyen, Hoang-Vu (Chapter; Peer reviewed, 2019)
    Au-Sn SLID bonding is a technique originally developed for harsh environment applications. The technology has recently shown promising results for ultrasound transducer fabrication. Characterizing the spatial and size ...
  • 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 ...
  • 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 ...
  • Small variations in nanoparticle structure dictate differential cellular stress responses and mode of cell death 

    Szwed, Marzena; Sønstevold, Tonje; Øverbye, Anders; Engedal, Nikolai; Grallert, Beata; Mørch, Ýrr Asbjørg; Sulheim, Einar; Iversen, Tore Geir; Skotland, Tore; Sandvig, Kirsten; Torgersen, Maria Lyngaas (Peer reviewed; Journal article, 2019)
    For optimal exploitation of nanoparticles (NPs) in biomedicine, and to predict nanotoxicity, detailed knowledge of the cellular responses to cell-bound or internalized NPs is imperative. The final outcome of NP-cell ...
  • Holistic approach for studying planetary hydrospheres: Gibbs representation of ices thermodynamics, elasticity and the water phase diagram to 2300 MPa 

    Journaux, Baptiste; Brown, Michael; Pakhomova, Anna; Collings, Ines; Petitgirard, Silvain; Espinoza, Penny; Ott, Jason; Cova, Federico Hector; Garbarino, Gaston; Hanfland, Michael (Peer reviewed; Journal article, 2020)
    Gibbs energy representations for ices II, III, V, and VI are reported. These were constructed using new measurements of volumes at high pressure over a range of low temperatures combined with calculated vibrational energies ...
  • Chiral Phonon Transport Induced by Topological Magnons 

    Thingstad, Even; Kamra, Akashdeep; Brataas, Arne; Sudbø, Asle (Peer reviewed; Journal article, 2019)
    The plethora of recent discoveries in the field of topological electronic insulators has inspired a search for boson systems with similar properties. There are predictions that ferromagnets on a two-dimensional honeycomb ...
  • Electric stress-induced slip lines in jammed particle monolayers 

    Mikkelsen, Alexander; Dommersnes, Paul Gunnar; Fossum, Jon Otto (Peer reviewed; Journal article, 2016)
    Drops fully covered by particles, so called Pickering emulsion drops, are used to stabilize emulsions and are ideal templates for producing particles and advanced capsules. Recent studies show how electrohydrodynamic ...
  • Soft-Clamp Fiber Bundle Model and Interfacial Crack Propagation: Comparison Using a Non-linear Imposed Displacement 

    Stormo, Arne; Lengliné, Olivier; Schmittbuhl, Jean; Hansen, Alex (Peer reviewed; Journal article, 2016)
    We compare experimental observations of a slow interfacial crack propagation along an heterogeneous interface to numerical simulations using a soft-clamped fiber bundle model. The model consists of a planar set of brittle ...
  • New Calculation of Secondary Antiprotons in Cosmic Rays 

    Moskalenko, Igor V.; Jóhannesson, Gudlaugur; Kachelriess, Michael; Orlando, E; Ostapchenko, Sergey; Porter, T.A. (Peer reviewed; Journal article, 2016)
    A dramatic increase in the accuracy and statistics of space-borne cosmic ray (CR) measurements has yielded several breakthroughs over the last several years. The most puzzling is the rise in the positron fraction above 10 ...
  • Escape model for Galactic cosmic rays 

    Giacinti, Gwenael; Kachelriess, Michael; Semikoz, Dimitry (Peer reviewed; Journal article, 2016)
    We show that the cosmic ray (CR) knee can be entirely explained by energy-dependent CR leak-age from the Milky Way, with an excellent fit to all existing data. We test this hypothesis cal-culating the trajectories of ...
  • Diffuse CR, neutrino and gamma-ray fluxes from AGNs 

    Giacinti, Gwenael; Kachelriess, Michael; Kalashev, Oleg; Neronov, Andrei; Semikoz, Dimitry (Peer reviewed; Journal article, 2016)
    We investigate how the extragalactic proton component derived within the ’escape model’ canbe explained by astrophysical sources. We find that the complete extragalactic proton spectrumcan be explained by a single source ...
  • Filler metal distribution and processing stability in laser-arc hybrid welding of thick HSLA steel 

    Bunaziv, Ivan; Wenner, Sigurd; Ren, Xiaobo; Frostevarg, Jan; Kaplan, Alexander F.H.; Akselsen, Odd Magne (Journal article; Peer reviewed, 2020)
    Welds made by high power laser beam have deep and narrow geometry. Addition offiller wire by the arc source,forming the laser-arc hybrid welding (LAHW) process, is very important to obtain required mechanical prop-erties. ...
  • 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 ...

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