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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.9: Poster

Freitag, 1. Oktober 2021, 10:00–13:00, P

Magnetic field dependent power loss of surface acoustic waves in thin nickel layers — •Jan Philipp Kress, Sebastian Kölsch, Alfons Schuck, and Michael Huth — Physikalisches Institut, Goethe Universität, Frankfurt am Main, Germany

Though mostly applied in mobile communication devices for high-frequency filtering in the GHz regime, surface acoustic wave (SAW) technology is also a promising approach in magnonics by employing the coupling of spin degrees of freedom with time-dependent elastic deformations. We present a simple setup for ferromagnetic resonance excitation by a surface acoustic wave with a rotatable electromagnet operating at room temperature. We tested our setup with an interdigital-transducer structure made from Cr/Au by UV lithography on YZ-cut LiNbO₃ and excited a Rayleigh-type SAW at a fundamental frequency of 290 MHz and measured its attenuation for various higher harmonics after passing a polycrystalline Ni thin film. By varying the magnetic field direction within the Ni thin film plane we measured the angle-dependent attenuation which can be related to the magneto-elastic coupling coefficient of Ni.