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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.7: Poster

Thursday, March 15, 2018, 15:00–18:00, Poster C

Resonant interaction of coherent magnons and phonons in a ferromagnetic nanograting — •Felix Godejohann¹, Alexey Scherbakov^1,2, Boris Glavin³, Serhii Kukhtaruk^1,3, Mu Wang⁴, Alexey Salasyuk², Alexey Danilov¹, Andrew Rushforth⁴, Polina Nekludova⁵, Sergei Sokolov⁵, Andrey Elistratov⁶, Dimitri Yakovlev^1,2, Andrey Akimov⁴, and Manfred Bayer^1,2 — ¹Exp. Phys. 2, TU Dortmund, Germany — ²Ioffe Inst., RAS, St. Petersburg, Russia — ³Dept. of Theo. Phys., V.E. Lashkaryov Inst. of Semiconductor Phys., Kyiv, Ukraine — ⁴School of Phys. and Astronomy, Univ. of Nottingham, UK — ⁵Inst. of Nanotech. of Microelectronics, RAS, Moscow, Russia — ⁶All-Russia Research Inst. of Automatics, Moscow, Russia

We investigate the magneto-phonon interaction in a ferromagnetic nanograting produced by focused ion beam in a 100 nm Fe_0.81Ga_0.19 film. The nanograting with lateral period of 150 nm consists of parallel grooves of 40 nm depth and width milled along [110]-crystallographic direction. We perform magneto-optical time-resolved measurements in a conventional pump-probe scheme with micron spatial resolution: the femtosecond pump pulse excites the nanograting, while the probe pulse serves to detect coherent lattice and magnetic response in time domain. We observe interaction of the localized surface phonon mode at the frequency of 20 GHz and quantized magnon spectrum. By external magnetic field we tune a certain magnon mode to the resonance with coherent phonons to control its spectral amplitude and lifetime.