title: A setup for element specific magnetization dynamics using the transverse magneto-optic Kerr effect in the energy range of 30-72 eV.
abstract: 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)].
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: S
authors.identifier: 0000000200391158
authors.initials: S
authors.lastname: Jana
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: J A
authors.initials: JA
authors.lastname: Terschlüsen
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: R
authors.initials: R
authors.lastname: Stefanuik
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: S
authors.initials: S
authors.lastname: Plogmaker
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: S
authors.identifier: 0000000150680778
authors.initials: S
authors.lastname: Troisi
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: R S
authors.identifier: 0000000250445329
authors.initials: RS
authors.lastname: Malik
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Svanqvist
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: R
authors.initials: R
authors.lastname: Knut
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: J
authors.identifier: 0000000296470394
authors.initials: J
authors.lastname: Söderström
authors.affiliation: Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden.
authors.forename: O
authors.identifier: 000000016406217X
authors.initials: O
authors.lastname: Karis