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Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 27: Magnetization / Demagnetization Dynamics I

MA 27.5: Talk

Wednesday, March 18, 2015, 10:30–10:45, EB 301

Ultrafast Generation of Magnetic Ordering in a First Order Phase Transition — •Robert Carley1, Sebastian Carron6, Tyler Chase4, Bruce Clemens4, Georgi Dakovski6, Eric Fullerton5, Patrick Granitzka4, Alexander Gray3, Stefan Günther2, Daniel Higley4, Manuel Izquierdo1, Emmanuelle Jal3, Loic Le Guyader7, Joel Li4, Serguei Molodtsov1, Mike Minitti6, Ankush Mitra6, Alexander Reid3, William Schlotter6, Vojtech Uhlir5, Joachim Stöhr3, Hermann Dürr3, Christian Back2, and Andreas Scherz11European XFEL, Hamburg, Germany — 2Universität Regensburg, Germany — 3SIMES, Stanford, California, USA — 4Stanford University, California, USA — 5University of California San Diego, USA — 6LCLS, Stanford, California, USA — 7HZB, Berlin, Germany

We report on recent experimental studies of the laser-driven antiferromagnetic (AFM) to ferromagnetic (FM) phase transition in FeRh using the time-, element-, and spatially resolving technique of resonant x-ray diffraction (tr-RXD) at the Fe L3 edge. FeRh undergoes a prototypical first order phase transition where the magnetization is the order parameter. The AFM to FM transition is accompanied by an isotropic lattice expansion. Time-resolved magneto-optical Kerr effect measurements suggest FM generation on sub-picosecond time scales, indicating an electronic process. In contrast, monitoring the lattice with time-resolved hard x-ray diffraction reveals nucleation and growth of FM regions on 10ps time-scales. This work aims to establish if the electronic system or the lattice drives the phase transition.

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