Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetization / Demagnetization Dynamics I
MA 15.10: Vortrag
Dienstag, 27. März 2012, 12:15–12:30, H 1012
Ultrafast and Distinct Spin Dynamics in Magnetic Alloys — •Ilie Radu1,2, Christian Stamm2, Andrea Eschenlohr2, Kadir Vahaplar1, Torsten Kachel2, Niko Pontius2, Rolf Mitzner2, Karsten Holldack2, Alexander Föhlisch2, Florin Radu2, Richard Evans3, Thomas Ostler3, Johan Mentink1, Roy Chantrell3, Arata Tsukamoto4, Akiyoshi Itoh4, Andrei Kirilyuk1, Alexey Kimel1, and Theo Rasing1 — 1Radboud University Nijmegen, The Netherlands — 2Helmholtz-Zentrum Berlin, BESSY II, Germany — 3University of York, United Kingdom — 4Nihon University, Japan
Recent time-resolved XMCD investigations of magnetization reversal in ferrimagnetic GdFeCo alloy have shown [1] the intriguing possibility of manipulating the magnetic order on the ultrafast timescales pertinent to the exchange interaction. In particular, we have demonstrated that the antiferromagnetically coupled Fe and Gd sublattices had very distinct demagnetization times and reversed via a transient ferromagnetic state. Here we report on a systematic study of femtosecond laser-induced spin dynamics in several ferromagnetic and ferrimagnetic alloys and reveal that such distinct spin dynamics in magnetic alloys is a general phenomenon [2]. We demonstrate that the demagnetization of the constituent magnetic sublattices evolves on significantly different timescales which depend on their elemental magnetic moments and exchange interaction. Funding through EU UltraMagnetron program is acknowledged. [1] I. Radu et al., Nature 472, 205 (2011) [2] I. Radu et al., submitted (2011)