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The Elliott-Yafet mechanism is arguably the most promising candidate toexplain the ultrafast demagnetization dynamics in ferromagnetic transitionmetals on timescales on the order of 100 femtoseconds. So far, onlyelectron-phonon scattering has been analyzed as the scattering process neededto account for the demagnetization due to the Elliott-Yafet mechanism. We showfor the first time that the electron-electron scattering contribution to theElliott-Yafet mechanism has the potential to explain time-resolvedmagneto-optical Kerr effect measurements on thin magnetic cobalt and nickelfilms, without reference to a phononic "spin bath."

Ultrafast demagnetization of ferromagnetic transition metals: The role of the Coulomb interaction