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Sökning: WFRF:(Baglai M.)

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1.
  • Sokolewicz, R. J., et al. (författare)
  • Gilbert damping in two-dimensional metallic antiferromagnets
  • 2024
  • Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 109:13
  • Tidskriftsartikel (refereegranskat)abstract
    • A finite spin life-time of conduction electrons may dominate Gilbert damping of two-dimensional metallic antiferromagnets or antiferromagnet / metal heterostructures. We investigate the Gilbert damping tensor for a typical low-energy model of a metallic antiferromagnet system with honeycomb magnetic lattice and Rashba spinorbit coupling for conduction electrons. We distinguish three regimes of spin relaxation: exchange-dominated relaxation for weak spin -orbit coupling strength, Elliot-Yafet relaxation for moderate spin -orbit coupling, and Dyakonov-Perel relaxation for strong spin -orbit coupling. We show, however, that the latter regime takes place only for the in -plane Gilbert damping component. We also show that anisotropy of Gilbert damping persists for any finite spin -orbit interaction strength provided we consider no spatial variation of the N & eacute;el vector. Isotropic Gilbert damping is restored only if the electron spin -orbit length is larger than the magnon wavelength. Our theory applies to MnPS 3 monolayer on Pt or to similar systems.
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2.
  • Baglai, Mikhail, et al. (författare)
  • Giant anisotropy of Gilbert damping in a Rashba honeycomb antiferromagnet
  • 2020
  • Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 101:10
  • Tidskriftsartikel (refereegranskat)abstract
    • Giant Gilbert damping anisotropy is identified as a signature of strong Rashba spin-orbit coupling in a two-dimensional antiferromagnet on a honeycomb lattice. The phenomenon originates in spin-orbit-induced splitting of conduction electron subbands that strongly suppresses certain spin-flip processes. As a result, the spin-orbit interaction is shown to support an undamped nonequilibrium dynamical mode that corresponds to an ultrafast in-plane Neel vector precession and a constant perpendicular-to-the-plane magnetization. The phenomenon is illustrated on the basis of a two-dimensional s-d-like model. Spin-orbit torques and conductivity are also computed microscopically for this model. Unlike Gilbert damping, these quantities are shown to reveal only a weak anisotropy that is limited to the semiconductor regime corresponding to the Fermi energy staying in the close vicinity of the antiferromagnetic gap.
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