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The microscopic origin of spin-orbit mediated spin-flips

Elliott, P. ; Singh, N. ; Krieger, K. ; Gross, E.K.U. ; Sharma, S. ; Dewhurst, J.K.

Journal of magnetism and magnetic materials, 2020-05, Vol.502, p.166473, Article 166473 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    The microscopic origin of spin-orbit mediated spin-flips
  • Autor: Elliott, P. ; Singh, N. ; Krieger, K. ; Gross, E.K.U. ; Sharma, S. ; Dewhurst, J.K.
  • Assuntos: Angular momentum ; Bulk density ; Computer simulation ; Demagnetization ; Density functional theory ; Electron spin ; Femtosecond ; First principles ; Magnetic moments ; Magnetism ; Spin-current ; Spin-orbit ; Spin-orbit interactions ; TDDFT ; Time dependence ; Ultrafast demagnetization
  • É parte de: Journal of magnetism and magnetic materials, 2020-05, Vol.502, p.166473, Article 166473
  • Descrição: •Spin-orbit coupling (SOC) induces circulating spin currents in the ground state.•Dynamics of these spin currents are responsible for SOC spin-flip demagnetization.•Laser excitation changes balance of torques on the spin currents.•Rotation of spin current axis leads to demagnetization.•In a simplified picture, spins precess due to effective SOC magnetic field. Laser induced ultrafast demagnetization is a powerful process by which the magnetic moment of a material can be modified on femtosecond timescales. However, to eventually utilize this process in technology, it is crucial that we develop a thorough understanding of the physical mechanisms involved. Based on ab initio simulations, spin-orbit mediated spin-flips have been proposed as one form of ultrafast demagnetization. In this paper, we explore this mechanism in more detail using time-dependent density functional theory (TDDFT) to study demagnetization in bulk Ni. We show why spin-orbit coupling (SOC) causes spin-flips by highlighting the importance of circulating spin currents induced by the coupling between the electronic spin and orbital motion. We present both a mathematical and heuristic picture of how SOC can cause demagnetization. Furthermore, we show that same arguments can be used to understand how the spin angular momentum is transferred to the lattice during laser induced demagnetization in a realistic material.
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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