Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.40: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Surface acoustic wave mediated magneto elastic investigation of magnetic thin films — •Matthias Küß1, Michael Heigl2, Andreas Hörner1, Manfred Albrecht2, and Achim Wixforth1 — 1Lehrstuhl für Experimentalphysik I, Universität Augsburg — 2Lehrstuhl für Experimentalphysik IV, Universität Augsburg
Magnetostriction describes the geometrical deformation of a magnet, caused by an applied magnetic field. The effect vice versa is named inverse magnetostriction. This mechanism in combination with surface acoustic strain waves (SAW) enables the manipulation of the magnetization on short time scales (∼ ns) and on micrometer distances. Since the SAW and magnonic modes are typically excited in the same radio frequency regime, both degrees of freedom have the potential to become strongly or even resonantly coupled [1]. Therefore, not only the magnetization, but also the properties of the SAW itself are mutually and characteristically changed. This can be easily measured in a delay line setup, made up of two interdigital transducers (IDT).
We use a vector network analyzer to study the interaction between GHz Rayleigh type SAWs and a ferromagnetic cobalt film as a function of magnetic field and sample orientation. On the one hand these experiments show the typical fourfold symmetry of elastically driven ferromagnetic resonance, which is caused by the longitudinal strain, accompanying the Rayleigh wave [1]. On the other hand, clear signature of vertical shear strain is observed, which gives rise to phenomena like nonreciprocal SAW propagation.
[1] M. Weiler et al., Phys. Rev. Lett. 106, 117601 (2011).