Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Non-ultrafast magnetization dynamics

MA 23.9: Talk

Wednesday, March 14, 2018, 11:45–12:00, H 0112

Time-resolved magneto-optical investigation of Surface Acoustic Wave sensors (SAW) — •Cai Müller, Anne Kittmann, Phillip Durdaut, Benjamin Spetzler, Sebastian Zabel, Rasmus B. Holländer, Michael Höft, Franz Faupel, Eckhard Quandt, and Jeffrey McCord — Institute for Materials Science, Kiel University, Kiel, Germany

Surface acoustic waves (SAW) delay lines and resonators can be tuned via magnetostrictive layers and application of an external magnetic field by magnon-phonon interactions [1]. This mechanism enables magnetic field sensing. Knowledge of the local magnetization structure during the SAW excitation helps to understand the exact magnetic origin of the SAW-modulation. Here investigations of the magneto-dynamic response of a thin FeCoSiB film on a quartz substrate by time-resolved magneto-optical wide-field imaging are presented. The method enables direct measurements of the wave velocity. The data suggests a strong magnetization response of domain walls to the local effective field generated by the SAW.

[1] Smole, P. et al., IEEE International Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003, p. 903-906 (2003)