Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Magnetization and Demagnetization Dynamics III

MA 36.2: Vortrag

Mittwoch, 9. März 2016, 15:15–15:30, H34

Magnetization dynamics driven by surface acoustic waves — Eric R. J. Edwards, •Rouven A. Dreyer, Niklas Liebing, and Georg Woltersdorf — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Deutschland

We use surface acoustic waves (SAW) to excite magnetization dynamics magneto-elastically in magnetic film and elements. Here we present a detailed experimental analysis of SAW driven ferromagnetic resonance in Nickel elements with different sizes as function of the external magnetic field amplitude, magnetic field orientation and SAW frequency (and wave vector). In the experiments the surface acoustic waves are excited at the surface of LiNbO3 substrates using lithographically patterned interdigital transducers (IDT). At the same time the induced magnetization dynamic is probed locally by time-resolved Kerr microscopy. The frequency (and wave vector) dependence of the SAW driven FMR is measured, using odd harmonics of the IDT fundamental frequency. The experimental results are described by a model based on the magneto-elastic coupling.