Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 29: Magnetization Dynamics II

MA 29.3: Vortrag

Mittwoch, 2. April 2014, 15:30–15:45, HSZ 401

Ultrafast demagnetization after laser irradiation: The influence of reduced exchange splitting — •Christian Illg, Michael Haag, and Manfred Fähnle — Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany

Electron-phonon scattering is one possible candidate to explain ultrafast demagnetization after laser irradiation in Ni, Fe or Co [1]. We calculate the demagnetization time and the demagnetization rate with ab-initio density-functional theory and estimate the phase space for scattering which is related to the maximum possible demagnetization. We do this for the ground-state band structure and for band structures with reduced exchange splitting (according to reduced magnetic moments). We find that both demagnetization rate and phase space are too small for reasonable excitations to explain the experimental demagnetization [2].

M. Fähnle, C. Illg, J. Phys.: Condens. Matter 23, 493201 (2011)
C. Illg, M. Haag, M. Fähnle, Phys. Rev. B, in press (2013)