Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Magnetization Dynamics I of 3
MA 33.8: Vortrag
Donnerstag, 14. März 2013, 11:15–11:30, H22
Tuning the Ultrafast Spin Dynamics in Magnetic Alloys — •Ilie Radu1, Christian Stamm1, Andrea Eschenlohr1, Kadir Vahaplar2, Torsten Kachel1, Niko Pontius1, Rolf Mitzner1, Karsten Holldack1, Alexander Föhlisch1, Florin Radu1, Richard Evans3, Thomas Ostler3, Johan Mentink2, Roy Chantrell3, Arata Tsukamoto4, Akiyoshi Itoh4, Andrei Kirilyuk2, Alexey Kimel2, and Theo Rasing2 — 1Helmholtz-Zentrum Berlin, BESSY II, Germany — 2Radboud University Nijmegen, The Netherlands — 3University of York, United Kingdom — 4Nihon University, Chiba, Japan
The microscopic mechanisms behind the ultrafast, laser-driven demagnetization remain an intriguing and actively debated issue of ultrafast magnetism. Here we report on laser-driven dynamics of multi-sublattice magnetic materials, with both ferromagnetic and antiferromagnetic coupling between sublattices, investigated using element-specific, femtosecond time-resolved XMCD. These measurements [1], fully supported by phenomenological modeling and atomistic spin simulations, provide evidence for a demagnetization time that scales with the elemental magnetic moment and varies with the sign of the exchange interaction. As such, one can tune the speed of magnetization processes in multi-sublattices alloys, being either switching or demagnetization, by properly choosing the magnitude of the constituent magnetic moments and the sign of the exchange interaction that couples them, as exemplified for the case of a synthetic ferrimagnet. [1] I. Radu et al., submitted (2012)