Blar i Publikasjoner fra CRIStin - NTNU på forfatter "Qaiumzadeh, Alireza"
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Anisotropies and magnetic phase transitions in insulating antiferromagnets determined by a Spin-Hall magnetoresistance probe
Lebrun, Romain; Ross, Andrew; Gomonay, Olena; Bender, Scott A.; Baldrati, Lorenzo; Kronast, Florian; Qaiumzadeh, Alireza; Sinova, Jairo; Brataas, Arne; Duine, Rembert; Klaui, Mathias Michael (Journal article; Peer reviewed, 2019)Antiferromagnets possess a number of intriguing and promising properties for electronic devices, which include a vanishing net magnetic moment and thus insensitivity to large magnetic fields and characteristic terahertz ... -
Bose–Einstein condensation of nonequilibrium magnons in confined systems
Mohseni, Morteza; Qaiumzadeh, Alireza; Serga, Alexander; Brataas, Arne; Hillebrands, Burkard; Pirro, Philipp (Peer reviewed; Journal article, 2020)We study the formation of a room temperature magnon Bose–Einstein condensate (BEC) in nanoscopic systems and demonstrate that its lifetime is influenced by the spatial confinement. We predict how dipolar interactions and ... -
Chiral ferromagnetism beyond Lifshitz invariants
Ado, I. A.; Qaiumzadeh, Alireza; Brataas, Arne; Titov, M. (Peer reviewed; Journal article, 2020)We consider a contribution w ch to the micromagnetic energy density that is linear with respect to the first spatial derivatives of the local magnetization direction. For a generalized two-dimensional Rashba ferromagnet, ... -
Control of magnetic states and spin interactions in bilayer CrCl3 with strain and electric fields: an ab initio study
Ebrahimian, Ali; Dyrdał, Anna; Qaiumzadeh, Alireza (Peer reviewed; Journal article, 2023)Using ab initio density functional theory, we demonstrated the possibility of controlling the magnetic ground-state properties of bilayer CrCl3 by means of mechanical strains and electric fields. In principle, we investigated ... -
Current-Driven Dynamics of Magnetic Hopfions
Wang, Xiansi; Qaiumzadeh, Alireza; Brataas, Arne (Journal article; Peer reviewed, 2019)opological magnetic textures have attracted considerable interest since they exhibit new properties and might be useful in information technology. Magnetic hopfions are three-dimensional (3D) spatial variations in the ... -
Impact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions
Gao, Tenghua; Qaiumzadeh, Alireza; Troncoso, Roberto E.; Haku, Satoshi; An, Hongyu; Nakayama, Hiroki; Tazaki, Yuya; Zhang, Song; Tu, Rong; Asami, Akio; Brataas, Arne; Ando, Kazuya (Peer reviewed; Journal article, 2023)Spintronic devices are based on heterojunctions of two materials with different magnetic and electronic properties. Although an energy barrier is naturally formed even at the interface of metallic heterojunctions, its ... -
Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
Lebrun, Romain; Ross, Andrew; Gomonay, Olena; Baltz, V.; Ebels, U; Barra, Anne Laure; Qaiumzadeh, Alireza; Brataas, Arne; Sinova, Jairo; Klaui, Mathias Michael (Peer reviewed; Journal article, 2020)Antiferromagnetic materials can host spin-waves with polarizations ranging from circular to linear depending on their magnetic anisotropies. Until now, only easy-axis anisotropy antiferromagnets with circularly polarized ... -
Magnetodynamic properties of dipole-coupled 1D magnonic crystals
Singh, Suraj Kumar; Wang, Xiansi; Kumar, Ankit; Qaiumzadeh, Alireza; Svedlindh, Peter; Tybell, Per Thomas Martin; Wahlström, Erik (Journal article, 2021)Magnonic crystals are magnetic metamaterials, that provide a promising way to manipulate magnetodynamic properties by controlling the geometry of the patterned structures. Here, we study the magnetodynamic properties of ... -
Micromagnetic study of spin transport in easy-plane antiferromagnetic insulators
Brehm, Verena Johanna; Gomonay, Olena; Lepadatu, Serban; Klaüi, Mathias; Sinova, Jairo; Brataas, Arne; Qaiumzadeh, Alireza (Journal article; Peer reviewed, 2023) -
Nonequilibrium magnons from hot electrons in antiferromagnetic systems
Barbeau, Marion; Titov, Mikhail; Katsnelson, Mikhail I.; Qaiumzadeh, Alireza (Peer reviewed; Journal article, 2023)We describe a \emph{nonthermal} magnon activation mechanism in antiferromagnetic (AFM) systems via locally equilibrated \emph{spin-unpolarized} hot electrons excited by an ultrafast intense laser pulse. We employ a quantum ... -
Propagation Length of Antiferromagnetic Magnons Governed by Domain Configurations
Ross, Andrew; Lebrun, Romain; Gomonay, Olena; Grave, Daniel A.; Kay, Asaf; Baldrati, Lorenzo; Becker, Sven; Qaiumzadeh, Alireza; Ulloa, Camilo; Jakob, Gerhard; Kronast, Florian; Sinova, Jairo; Duine, Rembert; Brataas, Arne; Rothschild, Avner; Klaui, Mathias Michael (Peer reviewed; Journal article, 2019)The compensated magnetic order and characteristic terahertz frequencies of antiferromagnetic materials make them promising candidates to develop a new class of robust, ultrafast spintronic devices. The manipulation of ... -
Quasiclassical theory for antiferromagnetic metals
Fyhn, Eirik Holm; Brataas, Arne; Qaiumzadeh, Alireza; Linder, Jacob Wüsthoff (Peer reviewed; Journal article, 2023)Unlike ferromagnetism, antiferromagnetism cannot readily be included in the quasiclassical Keldysh theory because of the rapid spatial variation in the directions of of the magnetic moments. The quasiclassical framework ... -
Scattering theory of transport through disordered magnets
Jakobsen, Martin Fonnum; Qaiumzadeh, Alireza; Brataas, Arne (Journal article; Peer reviewed, 2019)We present a scattering theory of transport through noncollinear disordered magnetic insulators. For concreteness, we study and compare the random field model (RFM) and the random anisotropy model (RAM). The RFM and RAM ... -
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. ... -
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 ... -
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 ... -
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 ...