Transient grating spectroscopy on a DyCo${}_5$ thin film with femtosecond extreme ultraviolet pulses

Abstract

Surface acoustic waves (SAWs) are excited by femtosecond extreme ultraviolet (EUV) transient gratings (TGs) in a room-temperature ferrimagnetic DyCo${}_5$ alloy. TGs are generated by crossing a pair of EUV pulses from a free electron laser (FEL) with the wavelength of 20.8\,nm matching the Co $M$-edge, resulting in a SAW wavelength of $\Lambda =44$\,nm. Using the pump-probe transient grating scheme in a reflection geometry the excited SAWs could be followed in the time range of -10 to 100\,ps in the thin film. Coherent generation of TGs by ultrafast EUV pulses allows to excite SAW in any material and to investigate their couplings to other dynamics such as spin waves and orbital dynamics. In contrast, we encountered challenges in detecting electronic and magnetic signals, potentially due to the dominance of the larger SAW signal and the weakened reflection signal from underlying layers. A potential solution for the latter challenge involves employing soft X-ray probes, albeit introducing additional complexities associated with the required grazing incidence geometry.

References in corpus (7)

• Hard X-ray Transient Grating Spectroscopy on Bismuth Germanate
• Frequency-independent terahertz anomalous Hall effect in DyCo${}_5$, Co${}_{32}$Fe${}_{68}$ and Gd${}_{27}$Fe${}_{73}$ thin films from DC to 40 THz
• Nanoscale transient magnetization gratings excited and probed by femtosecond extreme ultraviolet pulses
• All-optical switching on the nanometer scale excited and probed with femtosecond extreme ultraviolet pulses
• Effect of intense x-ray free-electron laser transient gratings on the magnetic domain structure of Tm:YIG
• Transient grating spectroscopy on a DyCo${}_5$ thin film with femtosecond extreme ultraviolet pulses
• Nanoscale transient polarization gratings

Cited by in corpus (1)

• Transient grating spectroscopy on a DyCo${}_5$ thin film with femtosecond extreme ultraviolet pulses