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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Magnetization Dynamics I of 3

MA 33.2: Talk

Thursday, March 14, 2013, 09:45–10:00, H22

Thermally assisted all-optical helicity dependent magnetic switching in Fe100-xTbx filmsAlexander Hassdenteufel1, Birgit Hebler1, Christian Schubert1, •Andreas Liebig1, Martin Teich2,3, Manfred Helm2,3, Martin Aeschlimann4, Manfred Albrecht1, and Rudolf Bratschitsch11Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz (Germany) — 2Helmholtz Zentrum Dresden Rossendorf, P. O. Box 510119, D-01314 Dresden (Germany) — 3Technische Universität Dresden, D-01062 Dresden (Germany) — 4Department of Physics and Research Center Optimas, University of Kaiserslautern, D-67663 Kaiserslautern (Germany)

Magnetization switching is at the heart of both modern information storage technology and fundamental science. Ultrafast laser pulses are promising to explore and finally reach the ultimate speed limit of this process. We present all-optical switching (AOS) in amorphous ferrimagnetic Fe100-xTbx alloy films with circularly polarized laser pulses. A Tb content of 22 to 34 at.% is necessary for AOS to occur. Outside this composition range pure thermal demagnetization is observed. AOS occurs not only below and above the magnetic compensation temperataure (Tcomp), but also in samples without Tcomp. We find that AOS is associated with laser heating up to the Curie temperature. AOS is intimately linked to a low remanent sample magnetization MR. Above a threshold magnetization of 220 emu/cc helicity dependent AOS is replaced by pure thermal demagnetization.

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