Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 52: Time-Resolved Spectroscopy III
O 52.2: Talk
Wednesday, February 27, 2008, 15:30–15:45, MA 042
Spin-dependent inter- and intraband scattering in image-potential-state bands on 3d ferromagnets — •Anke B. Schmidt1, Martin Pickel2, Markus Donath1, and Martin Weinelt2 — 1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany — 2Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin and Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany
We have observed ultrafast electron-magnon scattering of image-potential-state electrons on ultrathin ferromagnetic films in three different regions of energy and momentum transfer directly in the time domain. In our spin- and time-dependent photoemission experiment we employ the dispersing image-potential-state electron as observer or primary electron, thus effectively separating low-energy losses from direct decay into d-holes. For the quasielastic processes resonant interband scattering and dephasing at the band minimum as well as intraband scattering, an energy relaxation process, we found evidence to suggest that electron-magnon scattering constitutes a significant scattering channel for excited minority-spin electrons on iron even on the femtosecond timescale.