Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 67: Poster 4

MA 67.9: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG3

Spin waves in magnetic films driven by optical pulses at high repetition rates — •Manuel Jäckl¹, Vladimir I. Belotelov^2,3, Ilya A. Akimov^1,4, Igor V. Savochkin², Dmitri R. Yakovlev^1,4, Anatoly K. Zvezdin^3,5, and Manfred Bayer^1,4 — ¹Experimentelle Physik 2, TU Dortmund, 44221 Dortmund, Germany — ²Lomonosov Moscow State University, 119991 Moscow, Russia — ³Russian Quantum Center, Skolkovo, 143025 Moscow, Russia — ⁴Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ⁵Moscow Institute of Physics and Technology, Moscow Region 141700, Russia

We excite magnetization precession in bismuth-substituted iron garnet (BIG) films by a train of circularly polarized fs-laser pulses with a high repetition rate of 1 GHz which is faster than the decay rate of the oscillation. This periodic pumping establishes a quasi-stationary source of spin waves (SW), namely a coherent magnon cloud from which SWs are emitted. With this approach we generate spectrally narrow SWs, so they can propagate over long distances, traceble up to almost 100 µm, propagating with a pronounced directionally. Furthermore we can increase the amplitude by an enhancement factor of up to one order of magnitude by synchronizing its frequency with the pulse repetition rate.