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MA: Fachverband Magnetismus
MA 34: Magnetization / Demagnetization Dynamics III
MA 34.6: Talk
Wednesday, March 28, 2012, 16:15–16:30, H 1012
Fs-time and momentum resolved resonant magnetic x-ray scattering on EuTe — •Christoph Trabant1,2, Niko Pontius2, Enrico Schierle2, Eugen Weschke2, Torsten Kachel2, Rolf Mitzner2, Christian Schüßler-Langeheine2,1, Günther Springholz3, and Karsten Holldack2 — 1II. Physikalisches Institut, Universität zu Köln — 2G-I2/M-I1, Helmholtz-Zentrum Berlin — 3Institut für Halbleiterphysik, Johannes Kepler Universität, Linz,Austria
Antiferromagnetic (AFM) materials have been discussed to provide special conditions for ultrafast magnetization dynamics since no macroscopic magnetization exists and dynamics might not be restricted by conservation of angular momentum. EuTe is a prototype AFM semiconductor (2.2eV band-gap). The AFM order results from competing exchange interactions between
nearest-neighbors (FM coupling) and next-nearest-neighbors (AFM coupling) Eu2+ions, which sensitively depend on the ion distances. The AFM order is detectable by a (1/21/21/2) superstructure reflection by resonant soft x-ray diffraction (RSXD).
We investigate the photoinduced magnetic dynamics on the fs- and ps-time-scale for different sample compositions. By recording time resolved q-scans we find that the thin film magnetic profile is modified in a completely different way than for elevated temperatures in thermal equilibrium. The measurements have been performed at the FEMTOSPEX facility at BESSY II.