Journal
PHYSICAL REVIEW B
Volume 93, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.220301
Keywords
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Funding
- Office of Basic Energy Sciences of the US Department of Energy [DE-AC02-76SF00515]
- European Community [281043]
- Swedish Research Council (VR)
- SNIC
- LCLS
- Knut and Alice Wallenberg Foundation
- Czech Science Foundation [GJ15-08740Y]
- SIMES Institute
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We use femtosecond time-resolved hard x-ray scattering to detect coherent acoustic phonons generated during ultrafast laser excitation of ferromagnetic bcc Fe films grown on MgO(001). We observe the coherent longitudinal-acoustic phonons as a function of wave vector through analysis of the temporal oscillations in the x-ray scattering signal. The width of the extracted strain wave front associated with this coherent motion is similar to 100 fs. An effective electronic Gruneisen parameter is extracted within a two-temperature model. However, ab initio calculations show that the phonons are nonthermal on the time scale of the experiment, which calls into question the validity of extracting physical constants by fitting such a two-temperature model.
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