Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetization / Demagnetization Dynamics III
MA 43.7: Vortrag
Donnerstag, 19. März 2015, 11:15–11:30, EB 301
Spin precession mapping at ferromagnetic resonance via nuclear resonant — •Lars Bocklage1,2, Christian Swoboda3, Kai Schlage1, Hans-Christian Wille1, Liudmila Dzemiantsova1,2, Guido Meier4,2,3, and Ralf Röhlsberger1,2 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3Institut für Angewandte Physik, Universität Hamburg, Germany — 4Max-Planck-Institut für Struktur und Dynamik der Materie, Hamburg, Germany
We employed nuclear resonant scattering (NRS) to study spin dynamics at ferromagnetic resonance. NRS measures the temporal decay of nuclear transitions of Mössbauer isotopes, the 14.4 keV transition of iron-57 in our case. The inherent sensitivity to dynamical effects, its isotope sensitivity, and its combinability with diffraction techniques makes NRS a perfect candidate to investigate magnetization dynamics on nanometer length scales. We present NRS results measured on a ferromagnetic film excited at its ferromagnetic resonance in the GHz-regime. At ferromagnetic resonance the NRS time spectra of the nuclear decay are altered. The reduction of the effective hyperfinefield due to the spin precession is identified as source for the changes in the time spectra. We are able to determine the precession trajectory of the magnetic moments from the measured time spectra. The method provides a new way to study magnetization dynamics with high precision.