Dresden 2011 – scientific programme
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.101: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
Magnetizatio Dynamic In FeRh Compound — •Federico Pressacco1 and Simon Mariager2 — 1Universität Regensburg, Regensburg, Deutschland — 2Paul Scherrer Institute, Villigen, Switzerland
FeRh compounds show a first order phase transition from an Anti Ferromagnetic (AFM) to a Ferromagnetic (FM) phase after heating above room temperature. At temperature lower than 395 K the Fe ions are antiferromagnetically coupled while the Rh ions show no magnetic moment. At higher temperature Fe becomes ferromagnetically coupled and also Rh carries a magnetic moment. This phase transition in accompanied by a lattice expansion of about 1%.This features make FeRh a suitable system for investigation of the interplay between electrons, spins and phonons (lattice). We performed laser pump-probe experiments to investigate the magnetization dynamic via Time Resolved Magneto Optical Kerr Effect (TR-MOKE). The impulsive laser heating induce the phase transition and the magnetization is probed with a delayed laser pulse. The onset of the ferromagnetic phase is still under debate. Is the phase transition driven by the lattice expansion? Laser pump-X ray probe experiment where performed to follow the lattice expansion during the onset of the ferromagnetic phase. From the comparison of the data collected in the experiments one can decouple the phonon contribution to the signal and establish if the structural change induces the phase transition.