Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Surface Magnetism (joint session O/MA)

O 30.9: Vortrag

Dienstag, 2. April 2019, 12:30–12:45, H37

Disentangling spin-dependent scattering processes in thin Tb and Gd filmsGesa Siemann, •Wibke Bronsch, Beatrice Andres, and Martin Weinelt — Freie Universität Berlin, Deutschland

Studying the magnetic phase transition in thin Gd and Tb films by spin-resolved photoemission spectroscopy, we evaluated the linewidth of the (0001) surface state as a function of temperature in accordance with Ref.[1]. We observe different linewidths for the majority and minority spin components of the spin-mixed occupied surface state indicating differing scattering channels and concomitant spin-dependent lifetimes. A linear increase of the linewidth with temperature for T > TDebye allows us to evaluate the electron-phonon scattering rate. We find a larger slope for the majority-spin channel compatible with the higher density of bulk states for majority spin electrons at T<TCurie. Furthermore, we observed a greater Lorentz width for the minority-spin component, which is attributed to electron-magnon scattering. The contributions of electron-phonon and electron-magnon scattering to the linewidth of the surface state are comparable for Gd and Tb.

[1] Fedorov et al., Phys. Rev. B 65, 212409 (2002)

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