title: Spin precession mapping at ferromagnetic resonance via nuclear resonant scattering of synchrotron radiation.
abstract: We probe the spin dynamics in a thin magnetic film at ferromagnetic resonance by nuclear resonant scattering of synchrotron radiation at the 14.4 keV resonance of ^{57}Fe. The precession of the magnetization leads to an apparent reduction of the magnetic hyperfine field acting at the ^{57}Fe nuclei. The spin dynamics is described in a stochastic relaxation model adapted to the ferromagnetic resonance theory by Smit and Beljers to model the decay of the excited nuclear state. From the fits of the measured data, the shape of the precession cone of the spins is determined. Our results open a new perspective to determine magnetization dynamics in layered structures with very high depth resolution by employing ultrathin isotopic probe layers.
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.|The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: Lars
authors.initials: L
authors.lastname: Bocklage
authors.affiliation: The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.|Institut für Nanostruktur und Festkörperphysik, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Swoboda
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.
authors.forename: Kai
authors.initials: K
authors.lastname: Schlage
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.
authors.forename: Hans-Christian
authors.initials: HC
authors.lastname: Wille
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.|The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: Liudmila
authors.initials: L
authors.lastname: Dzemiantsova
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.
authors.forename: Saša
authors.initials: S
authors.lastname: Bajt
authors.affiliation: The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.|Institut für Nanostruktur und Festkörperphysik, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.|Max-Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: Guido
authors.initials: G
authors.lastname: Meier
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.|The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Röhlsberger