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MA: Fachverband Magnetismus
MA 5: Magnetization/Demagnetization Dynamics
MA 5.10: Vortrag
Montag, 20. März 2017, 12:00–12:15, HSZ 401
Imaging of the dynamic magnetoelastic effect in ferromagnetic layers induced by surface acoustic waves — Michael Foerster1, Ferran Macià2,3, Nahuel Statuto3, Simone Finizio4,5, •Alberto Hernández-Mínguez6, Sergi Lendínez3, Paulo Santos6, Josep Fontcuberta2, Joan Manel Hernàndez3, Mathias Kläui4, and Lucia Aballe1 — 1ALBA Synchrotron Light Source, Spain — 2Institut de Ciència de Materials de Barcelona, Spain — 3University of Barcelona, Spain — 4Johannes Gutenberg Universität Mainz, Germany — 5Paul Scherrer Institut, Switzerland — 6Paul-Drude-Institut für Festkörperelektronik, Germany
The exploitation of magnetoelasticity is a promising alternative to the use of magnetic fields for the dynamic control of magnetization states of nanoelements. In this contribution, we study the effect of surface acoustic waves (SAWs) on the magnetization dynamics of 20 nm thick nickel nanostructures deposited on a piezoelectric substrate. By combining X-ray magnetic circular dichroism with photoemission electron microscopy, and synchronizing the SAW frequency with the X-rays repetition rate, we obtain simultaneous stroboscopic images of the magnetization domains and the SAW propagating along the nanostructures with temporal resolution down to the picosecond scale. Our results demonstrate a time delay between the magnetization dynamics and the SAW-induced strain field that depends on the orientation of the magnetic domains with respect to the SAW propagation direction. The versatility of our experimental technique provides a new pathway to the quantitative study of dynamic magnetoelastic effects at the nanoscale.