Journal
PHYSICAL REVIEW RESEARCH
Volume 4, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.4.L022062
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Funding
- German Research Foundation (DFG, Germany) [CRC/TRR 227, 328545488]
- European Union through EFRE [1.8/10, 1.8/15]
- European Union [EFRE 1.8/13]
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We investigated the femtosecond laser-induced spin dynamics in nanostructured magnetic materials using time- and angle-resolved transverse magneto-optical Kerr effect spectroscopy in the soft x-ray range. Through polarization-dependent magnetic scattering simulations, we determined the spatiotemporal and element-specific evolution of spin dynamics and understand the contributions from nonequilibrium electron transport and nanoscale heat diffusion.
We report on time- and angle-resolved transverse magneto-optical Kerr effect spectroscopy in the soft x-ray range that, by analysis via polarization-dependent magnetic scattering simulations, allows us to determine the spatiotemporal and element-specific evolution of femtosecond laser-induced spin dynamics in nanostructured magnetic materials. In a ferrimagnetic GdFe thin-film system, we correlate a reshaping spectrum of the magneto-optical Kerr signal to depth-dependent magnetization dynamics and disentangle contributions due to nonequilibrium electron transport and nanoscale heat diffusion on their intrinsic timescales. Our Letter provides a quantitative insight into light-driven spin dynamics occurring at buried interfaces of complex magnetic heterostructures, which can be tailored and functionalized for future optospintronic devices.
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