Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.10: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Surface acoustic wave mediated magneto elastic investigation of magnetic thin film systems — •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. Therefore, not only the magnetization, but also the properties of the SAW itself are characteristically changed. This can be easily measured in a delay line setup, made up of two interdigital transducers (IDT).
Besides highly magnetostrictive ferrimagnetic TbFe thin films, exchanged-biased CoFeB/CoO, consisting of a soft ferromagnet CoFeB and an antiferromagnetic CoO layer, are studied. Because the Néel temperature of the antiferromagnet is at about 160 K, it is possible to probe the impact of the exchange bias effect on the magnetoacoustic interaction below and above the blocking temperature. First results obtained on magnetization reversal at room temperature as a function of sample orientation show good accordance with the theory of elastically driven ferromagnetic resonance.