Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Spin Dynamics / Spin Torque I

MA 14.6: Vortrag

Mittwoch, 24. März 2010, 11:00–11:15, H10

Electron-phonon contribution to the ultrafast demagnetization of ferromagnetic metals — •Sven Essert, Michael Krauß, and Hans Christian Schneider — TU Kaiserslautern, 67653 Kaiserslautern, Germany

The Elliott-Yafet (EY)-mechanism is arguably the most promising candidate to explain the light-induced ultrafast demagnetization dynamics in ferromagnetic transition metals on time scales on the order of 100 fs. By numerically solving dynamical equations for spin and energy-resolved electronic distribution functions and including electron-electron interactions at the level of Boltzmann scattering integrals, we were able to show [1] that an EY-like mechanism based on electron-electron scattering has the potential to explain time-resolved magneto-optical Kerr effect measurements on thin magnetic cobalt and nickel films, without reference to a “phononic spin bath”. In this contribution, we include the electron-phonon interaction as an additional scattering mechanism in our approach. We compare our numerical results for cobalt and nickel with other approaches, which assume electron-phonon scattering as the spin-diagonal scattering process underlying the demagnetization. [2]

[1] M. Krauß, T. Roth, S. Alebrand, D. Steil, M. Cinchetti, M. Aeschlimann, and H. C. Schneider, Phys. Rev. B 80, 180407(R) (2009)

[2] D. Steiauf and M. Fähnle, Phys. Rev. B 79, 140401(R) (2009)