Nanoscale Transient Magnetization Gratings Created and Probed by Femtosecond Extreme Ultraviolet Pulses
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Nanoscale_transient_magnetization_gratings_excited.pdf
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Author(s)
Ksenzov, Dmitriy
Maznev, Alexei A
Unikandanunni, Vivek
Bencivenga, Filippo
Capotondi, Flavio
Caretta, Antonio
Foglia, Laura
Malvestuto, Marco
Masciovecchio, Claudio
Mincigrucci, Riccardo
Date Issued
2021
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Ksenzov, Dmitriy, Maznev, Alexei A, Unikandanunni, Vivek, Bencivenga, Filippo, Capotondi, Flavio et al. 2021. "Nanoscale Transient Magnetization Gratings Created and Probed by Femtosecond Extreme Ultraviolet Pulses." Nano Letters, 21 (7).
Version
Author's final manuscript
Abstract
We utilize coherent femtosecond extreme ultraviolet (EUV) pulses from a free electron laser (FEL) to generate transient periodic magnetization patterns with periods as short as 44 nm. Combining spatially periodic excitation with resonant probing at the M-edge of cobalt allows us to create and probe transient gratings of electronic and magnetic excitations in a CoGd alloy. In a demagnetized sample, we observe an electronic excitation with a rise time close to the FEL pulse duration and ∼0.5 ps decay time indicative of electron-phonon relaxation. When the sample is magnetized to saturation in an external field, we observe a magnetization grating, which appears on a subpicosecond time scale as the sample is demagnetized at the maxima of the EUV intensity and then decays on the time scale of tens of picoseconds via thermal diffusion. The described approach opens multiple avenues for studying dynamics of ultrafast magnetic phenomena on nanometer length scales.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1021/ACS.NANOLETT.0C05083
