Ultrafast reduction of the total magnetization in iron

Fognini, A.; Gerasimova, Natalia; Kukreja, R.; Dell'Angela, M.; Al-Shemmary, A.; Pescia, D.; Hieke, Florian; Dürr, H. A.; Vaterlaus, A.; Wurth, Wilfried; Salvatella, G.; Pontius, N.; Föhlisch, A.; Jong, S. de; Stamm, C.; Bähler, T.; Rybnikov, V.; Raabe, J.; Eschenlohr, A.; Redlin, H.; Sorgenfrei, F.; Ramsperger, U.; Michlmayr, T. U.; Acremann, Y.; Wetli, C.; Beye, M.

doi:10.1063/1.4862476

Journal Article

DESY-2014-02412

Ultrafast reduction of the total magnetization in iron

Fognini, A. (Corresponding Author) ; Michlmayr, T. U. ; Salvatella, G. ; Wetli, C. ; Ramsperger, U. ; Bähler, T. ; Sorgenfrei, F. ; Beye, M. ; Eschenlohr, A. ; Pontius, N. ; Stamm, C. ; Hieke, F.>CFEL* ; Dell'Angela, M.>CFEL* ; Jong, S. d. ; Kukreja, R. ; Gerasimova, N.XFEL*DESY* ; Rybnikov, V.DESY* ; Al-Shemmary, A.DESY* ; Redlin, H.DESY* ; Raabe, J. ; Föhlisch, A. ; Dürr, H. A. ; Wurth, W.>CFEL* ; Pescia, D. ; Vaterlaus, A. ; Acremann, Y.

2014
American Institute of Physics Melville, NY

Applied physics letters 104(3), 032402 (2014) [10.1063/1.4862476]

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Abstract: Surprisingly, if a ferromagnet is exposed to an ultrafast laser pulse, its apparent magnetization isreduced within less than a picosecond. Up to now, the total magnetization, i.e., the average spinpolarization of the whole valence band, was not detectable on a sub-picosecond time scale. Here,we present experimental data, confirming the ultrafast reduction of the total magnetization. Softx-ray pulses from the free electron laser in Hamburg (FLASH) extract polarized cascadephotoelectrons from an iron layer excited by a femtosecond laser pulse. The spin polarization ofthe emitted electrons is detected by a Mott spin polarimeter.

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