A setup for element specific magnetization dynamics using the transverse magneto-optic Kerr effect in the energy range of 30-72 eV
| Autor: | Joachim Andreas Terschlüsen, Robert Stefanuik, Ronny Knut, Olof Karis, Rameez Saeed Malik, Somnath Jana, Sara Troisi, Mathias Svanqvist, Stefan Plogmaker, Johan Söderström |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Permalloy Magnetization dynamics Kerr effect Spectrometer business.industry Demagnetizing field 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetization Optics Magneto-optic Kerr effect 0103 physical sciences High harmonic generation Atomic physics 010306 general physics 0210 nano-technology business Instrumentation |
| Zdroj: | The Review of scientific instruments. 88(3) |
| ISSN: | 1089-7623 |
| Popis: | In this paper, we present a spectrometer that is designed for element-specific and time-resolved transverse magneto-optic Kerr effect experiments at the high-harmonic generation pump-probe facility High Energy Laser Induced Overtone Source (HELIOS) laboratory. HELIOS delivers photons with energies between 30 eV and 72 eV with an overall time resolution of less than 40 fs. The spectrometer is based on a Rowland-circle geometry and allows for simultaneous measurements of all magnetic transition-metal elements. The setup also features easy sample transfer and alignment, and it combines high photon throughput, optimized data acquisition, and a fast switching of the magnetic field at the sample. The spectrometer performance is demonstrated by measuring the ultrafast demagnetization of permalloy. Our data are, for all practical purposes, identical to what have been reported in the earlier high-order harmonic generation work of a similar sample by Mathias et al. [Proc. Natl. Acad. Sci. U. S. A. 109, 4792-4797 (2012)], however, obtained within 15% of the acquisition time compared to their study. Furthermore, our data show a shift of the demagnetization curve of Ni relative to Fe, which has previously been interpreted as a delay of the Ni demagnetization to that of Fe [S. Mathias et al., Proc. Natl. Acad. Sci. U. S. A. 109, 4792-4797 (2012)]. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|