Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Magnetization Dynamics III of 3
MA 49.1: Talk
Friday, March 15, 2013, 09:30–09:45, H22
Driving magnetization dynamics via mid-infrared phonon excitation — •Sebastian Mährlein1, Ilie Radu2, Michael Gensch3, Alexey Kimel4, Alexandra Kalashnikova5, Roman Pisarev5, Martin Wolf1, and Tobias Kampfrath1 — 1Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany — 2Helmholtz-Zentrum Berlin BESSY II, 12489 Berlin, Germany — 3Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany — 4Radboud University Nijmegen, Nijmegen 6525AJ, The Netherlands — 5A.F. Ioffe Physical Technical Institute, St. Petersburg 194021, Russia
The fundamental interactions between electrons, spins and the lattice of a solid have always been subject of large scientific interest. Here, we investigate the coupling between phonons and the ordered spin system of ferrimagnetic oxides on ultrashort time scales, an elusive and actively debated issue of modern ultrafast magnetism.
For this purpose, we use intense electromagnetic pulses at terahertz (THz) frequencies, from both table-top and accelerator-based sources, to resonantly excite a specific phonon mode. The impact of this vibrational excitation on the spin system is monitored by detecting the transient Faraday rotation of a subsequently arriving optical probe pulse. As such, we obtain access to the magnetization dynamics with a time resolution of down to 10fs. These mode-selective pumping experiments show a response of the spin system on a timescale of few picoseconds and thus indicate an (ultra)fast spin-lattice interaction. The possible underlying coupling mechanisms will be discussed.