Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Magnetization Dynamics I of 3
MA 33.5: Talk
Thursday, March 14, 2013, 10:30–10:45, H22
On the role of the transient ferromagnetic-like state and of the magnetization compensation temperature in all-optical magnetization switching in GdFe ferrimagnetic alloys — •Loïc Le Guyader1,2, Ilie Radu2, Souliman El Moussaoui1, Michele Buzzi1, Ilya Razdolski3, Rajasekhar Medapalli3, Matteo Savoini3, Christian Stamm2, Rolf Mitzner2, Karsten Holldack2, Torsten Kachel2, Arata Tsukamoto4, Akiyoshi Itoh4, Frithjof Nolting1, Andrei Kirilyuk3, Theo Rasing3, and Alexey Kimel3 — 1Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — 3Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 4College of Science and Technology, Nihon University, Chiba, Japan
Understanding the ultrafast all optical magnetization reversal is a challenging issue which could have tremendous impact for the magnetic recording industry. Combining femtosecond X-ray transmission measurements with picosecond time-resolved photo-emission electron microscopy, both using X-ray magnetic circular dichroism, we report on new insights into the ultrafast magnetization switching in GdFe ferrimagnetic alloys. In particular, we demonstrate that a prerequisite for all optical magnetization switching is the existence of a transient ferromagnetic-like state. Indeed, for sample temperature far from the magnetization compensation temperature, such transient state is not observed, leading to no switching behaviour.