Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetization / Demagnetization Dynamics I

MA 15.8: Vortrag

Dienstag, 27. März 2012, 11:45–12:00, H 1012

Ultrafast lattice dynamics in FeRh during a laser-induced magnetic phase transition — •Florian Quirin, Michael Vattilana, Uladzimir Shymanovich, Abd-Elmonien El-Kamhawy, Matthieu Nicoul, Alexander Tarasevitch, Dietrich von der Linde, and Klaus Sokolowski-Tinten — Universität Duisburg-Essen, Duisburg, Germany

FeRh exhibits an anti-ferromagnetic to ferromagnetic phase transition upon heating to temperatures above 353 K, which is accompanied by an iso-structural increase in volume of about 1%. Recent results of time-resolved magneto-optical experiments gave indication that after intense optical excitation ferromagnetic order starts to build up on sub-ps time-scales [1,2]. We have used time-resolved X-ray diffraction with fs X-ray pulses from a laser-produced plasma to directly follow the lattice response of FeRh after optical excitation. From experimental data obtained at different starting temperatures below and above the phase transition temperature we have to conclude that the fast changes of the magnetic properties do not lead to the corresponding structural changes as under equilibrium conditions.

1 G. Ju, J. Hohlfeld, B. Bergman, R. J. M. van deVeerdonk, O. N. Mryasov, J.-Y. Kim, X. Wu, D. Weller, and B. Koopmans, Phys. Rev. Lett. 93, 197403 (2004).

2 J.-U. Thiele, M. Buess, and C. H. Back, Appl. Phys. Lett. 85, 2857 (2004).