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Proceedings Paper

Dynamic demagnetization in magnetic thin films using a new pump-probe system in the 6 femtosecond range
Author(s): C. S. Gonçalves; Ana S. Silva; Helder Crespo; D. S. Schmool
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Paper Abstract

Time resolution limited dynamic measurements show the need for improved techniques to access ultrafast demagnetisation processes on the sub-10 femtosecond timescale. We have constructed a state-of- the-art time-resolved magneto-optic Kerr effect (TR-MOKE) apparatus for the observation of ultrafast demagnetization and precessional dynamics in ferromagnetic materials. Our system can operate well below the current ranges used by most researchers (typically in the region of 40 fs). Using current ultrafast optical methods of pulse compression, designed to obtain unprecedented temporal resolution, we have developed a dual-colour pump-probe technique: This enables us to attain an ultimate resolution in the 12 fs range, the spectral range being split between pump and probe beams. We have demonstrated that the system has the capacity for ultrafast demagnetization measurements using a GdFeCo thin film. Future developments will employ the full spectral range in both pump and probe branches to reach an expected temporal resolution in the vicinity of 6 fs, corresponding to few-cycle pulses.

Paper Details

Date Published: 18 November 2013
PDF: 6 pages
Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87854N (18 November 2013); doi: 10.1117/12.2026215
Show Author Affiliations
C. S. Gonçalves, Univ. do Porto (Portugal)
Ana S. Silva, Univ. do Porto (Portugal)
Helder Crespo, Univ. do Porto (Portugal)
D. S. Schmool, Univ. do Porto (Portugal)


Published in SPIE Proceedings Vol. 8785:
8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
Manuel Filipe P. C. Martins Costa, Editor(s)

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