Ab initio investigation of light-induced relativistic spin-flip effects in magneto-optics

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2015
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Berritta, Marco
Carva, Karel
Oppeneer, Peter M.
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European Union (EU): 281043
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FEMTOSPIN - Multiscale Modelling of Femtosecond Spin Dynamics
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Physical Review B. 2015, 91(17), 174415. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.91.174415
Zusammenfassung

Excitation of a metallic ferromagnet such as Ni with an intensive femtosecond laser pulse causes an ultrafast demagnetization within approximately 300 fs. It was proposed that the ultrafast demagnetization measured in femtosecond magneto-optical experiments could be due to relativistic light-induced processes. We perform an ab initio investigation of the influence of relativistic effects on the magneto-optical response of Ni. To this end, first, we develop a response theory formulation of the additional appearing ultrarelativistic terms in the Foldy-Wouthuysen transformed Dirac Hamiltonian due to the electromagnetic field, and second, we compute the influence of relativistic light-induced spin-flip transitions on the magneto-optics. Our ab initio calculations of relativistic spin-flip optical excitations predict that these can give only a very small contribution (≤0.1%) to the laser-induced magnetization change in Ni.

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ISO 690MONDAL, Ritwik, Marco BERRITTA, Karel CARVA, Peter M. OPPENEER, 2015. Ab initio investigation of light-induced relativistic spin-flip effects in magneto-optics. In: Physical Review B. 2015, 91(17), 174415. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.91.174415
BibTex
@article{Mondal2015initi-46214,
  year={2015},
  doi={10.1103/PhysRevB.91.174415},
  title={Ab initio investigation of light-induced relativistic spin-flip effects in magneto-optics},
  number={17},
  volume={91},
  issn={1098-0121},
  journal={Physical Review B},
  author={Mondal, Ritwik and Berritta, Marco and Carva, Karel and Oppeneer, Peter M.},
  note={Article Number: 174415}
}
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