SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Ultrafast Magnetization Effects I
MA 8.9: Vortrag
Montag, 27. März 2023, 17:15–17:30, HSZ 04
MEASURING THE SPIN-FLIP SCATTERING RATES IN THE DEMAGNETIZATION TRANSIENT STATE OF FERROMAGNETS — •Régis Decker1, Artur Born1,2, Kari Ruotsalainen1, Karl Bauer1, Robby Büchner1,2, Robert Haverkamp1,2, Annette Pietzsch1, and Alexander Föhlisch1,2 — 1Institute Methods and Instrumentation for Synchrotron Radiation Research PS-ISRR, Helmholtz-Zentrum Berlin für Materialien und Energie Albert-Einstein-Strasse 15, 12489, Berlin, Germany. — 2Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476, Potsdam, Germany
In crystalline ferromagnets, one of the main microscopic mechanisms of spin relaxation is the electron-phonon driven (Elliott-Yafet) spin-flip scattering. To deduce the spin-flip scattering rate, we exploit the stringent atomic symmetry selection rules of X-ray Emission Spectroscopy (XES) and observe the quantifiable change in the decay peak intensities in static XES spectra when changing the temperature, i.e. the phonon population. We deduce the temperature-dependent spin-flip scattering rate for Ni [1]. In FeNi alloys, we evidence a thresholding the Elliott-Yafet mechanism linked to the intra- and intersublattice exchange energies [2]. In Gd, we show an Elliott-Yafet mechanism for the itinerant 5d electrons and its absence for the localized 4f electrons [3].
[1] R. Decker et al., Sci. Rep. 9, 8977 (2019). [2] A. Born et al., Sci. Rep. 11, 1883 (2021). [3] R. Decker et al., Appl. Phys. Lett. 119, 152403 (2021).