Direct imaging of delayed magneto-dynamic modes induced by surface acoustic waves

Michael Foerster, Ferran Macià (), Nahuel Statuto, Simone Finizio, Alberto Hernández-Mínguez, Sergi Lendínez, Paulo V. Santos, Josep Fontcuberta, Joan Manel Hernàndez, Mathias Kläui and Lucia Aballe
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Michael Foerster: ALBA Synchrotron Light Source
Ferran Macià: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
Nahuel Statuto: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
Simone Finizio: Johannes Gutenberg Universität Mainz
Alberto Hernández-Mínguez: Paul-Drude-Institut fur Festkörperelektronik
Sergi Lendínez: University of Barcelona
Paulo V. Santos: Paul-Drude-Institut fur Festkörperelektronik
Josep Fontcuberta: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
Joan Manel Hernàndez: University of Barcelona
Mathias Kläui: Johannes Gutenberg Universität Mainz
Lucia Aballe: ALBA Synchrotron Light Source

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract The magnetoelastic effect—the change of magnetic properties caused by the elastic deformation of a magnetic material—has been proposed as an alternative approach to magnetic fields for the low-power control of magnetization states of nanoelements since it avoids charge currents, which entail ohmic losses. Here, we have studied the effect of dynamic strain accompanying a surface acoustic wave on magnetic nanostructures in thermal equilibrium. We have developed an experimental technique based on stroboscopic X-ray microscopy that provides a pathway to the quantitative study of strain waves and magnetization at the nanoscale. We have simultaneously imaged the evolution of both strain and magnetization dynamics of nanostructures at the picosecond time scale and found that magnetization modes have a delayed response to the strain modes, adjustable by the magnetic domain configuration. Our results provide fundamental insight into magnetoelastic coupling in nanostructures and have implications for the design of strain-controlled magnetostrictive nano-devices.

Date: 2017
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DOI: 10.1038/s41467-017-00456-0

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