Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Magnetization Dynamics I of 3

MA 33.5: Vortrag

Donnerstag, 14. März 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 Guyader^1,2, 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.