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Träfflista för sökning "WFRF:(B Klautau Angela) srt2:(2020-2023)"

Search: WFRF:(B Klautau Angela) > (2020-2023)

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1.
  • Cardias, Ramon, et al. (author)
  • Unraveling the connection between high-order magnetic interactions and local-to-global spin Hamiltonian in noncollinear magnetic dimers
  • 2023
  • In: Physical Review B. - : American Physical Society (APS). - 2469-9950 .- 2469-9969. ; 108:22
  • Journal article (peer-reviewed)abstract
    • A spin Hamiltonian that characterizes interatomic interactions between spin moments is highly valuable in predicting and comprehending the magnetic properties of materials. Here, we explore a method for explicitly calculating interatomic exchange interactions in noncollinear configurations of magnetic materials considering only a bilinear spin Hamiltonian in a local scenario. Based on density-functional theory calculations of dimers adsorbed on metallic surfaces, and with a focus on the Dzyaloshinskii-Moriya interaction (DMI) which is essential for stabilizing chiral noncollinear magnetic states, we discuss the interpretation of the DMI when decomposed into microscopic electron and spin densities and currents. We clarify the distinct origins of spin currents induced in the system and their connection to the DMI. In addition, we reveal how noncollinearity affects the usual DMI, which is solely induced by spin-orbit coupling, and DMI-like interactions brought about by noncollinearity. We explain how the dependence of the DMI on the magnetic configuration establishes a connection between high-order magnetic interactions, enabling the transition from a local to a global spin Hamiltonian.
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2.
  • Carvalho, Pamela C., et al. (author)
  • Correlation of Interface Interdiffusion and Skyrmionic Phases
  • 2023
  • In: Nano Letters. - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 23:11, s. 4854-4861
  • Journal article (peer-reviewed)abstract
    • Magnetic skyrmions are prime candidates for the nextgenerationof spintronic devices. Skyrmions and other topological magnetic structuresare known to be stabilized by the Dzyaloshinskii-Moriya interaction(DMI) that occurs when the inversion symmetry is broken in thin films.Here, we show by first-principles calculations and atomistic spindynamics simulations that metastable skyrmionic states can also befound in nominally symmetric multilayered systems. We demonstratethat this is correlated with the large enhancement of the DMI strengthdue to the presence of local defects. In particular, we find thatmetastable skyrmions can occur in Pd/Co/Pd multilayers without externalmagnetic fields and can be stable even near room temperature conditions.Our theoretical findings corroborate with magnetic force microscopyimages and X-ray magnetic circular dichroism measurements and highlightthe possibility of tuning the intensity of DMI by using interdiffusionat thin film interfaces.
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