The microscopic origin of spin-orbit mediated spin-flips

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


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.

Original languageAmerican English
Article number166473
JournalJournal of Magnetism and Magnetic Materials
StatePublished - 15 May 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.


  • First principles
  • Spin-current
  • Spin-orbit
  • Ultrafast demagnetization


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