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Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.7: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Resonant interaction of coherent magnons and phonons in a ferromagnetic nanograting — •Felix Godejohann1, Alexey Scherbakov1,2, Boris Glavin3, Serhii Kukhtaruk1,3, Mu Wang4, Alexey Salasyuk2, Alexey Danilov1, Andrew Rushforth4, Polina Nekludova5, Sergei Sokolov5, Andrey Elistratov6, Dimitri Yakovlev1,2, Andrey Akimov4, and Manfred Bayer1,21Exp. 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 Fe0.81Ga0.19 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.

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DPG-Physik > DPG-Verhandlungen > 2018 > Berlin