Ultrafast reduction of the total magnetization in iron

Applied Physics Letters - Tập 104 Số 3 - 2014
Andreas Fognini1, T. Michlmayr1, G. Salvatella1, C. Wetli2, U. Ramsperger3, T. Bähler3, F. Sorgenfrei4, Martin Beye4, Andrea Eschenlohr4, N. Pontius4, C. Stamm5,4, F. Hieke6, Martina Dell’Angela6, S. de Jong7, Roopali Kukreja8,7, Natalia Gerasimova9, V. Rybnikov9, A. Al-Shemmary9, H. Redlin9, Jörg Raabe10, Alexander Föhlisch4, H. A. Dürr7, W. Würth6, D. Pescia3, A. Vaterlaus1, Yves Acremann1
1Laboratory for Solid State Physics 1 , Otto-Stern-Weg 1, ETH Zurich, 8093 Zurich, Switzerland
2Multifunktionale Ferroische Mat. 2 , Vladimir-Prelog-Weg 1-5/10, ETH Zurich, 8093 Zurich, Switzerland
3Laboratory for Solid State Physics 3 , Auguste-Piccard-Hof 1, ETH Zurich, 8093 Zurich, Switzerland
4Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung 4 , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany
5Department of Materials, ETH Zurich 5 , Hönggerbergring 64, 8093 Zurich, Switzerland
6Institut für Experimentalphysik and Center for Free-Electron Laser Science, Universität Hamburg 6 , 22607 Hamburg, Germany
7SLAC National Accelerator Laboratory 7 , Menlo Park, California 94025, USA
8Department of Materials Science and Engineering, Stanford University 8 , California 94305, USA
9Deutsches Elektronen-Synchrotron DESY 9 , 22607 Hamburg, Germany
10Paul Scherrer Institute 10 , 5232 Villigen, Switzerland

Tóm tắt

Surprisingly, if a ferromagnet is exposed to an ultrafast laser pulse, its apparent magnetization is reduced within less than a picosecond. Up to now, the total magnetization, i.e., the average spin polarization 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. Soft x-ray pulses from the free electron laser in Hamburg (FLASH) extract polarized cascade photoelectrons from an iron layer excited by a femtosecond laser pulse. The spin polarization of the emitted electrons is detected by a Mott spin polarimeter.

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Applied Physics Letters

Tập 104 Số 3

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