Capturing ultrafast magnetic dynamics by time-resolved soft x-ray magnetic circular dichroism

Abstract

Experiments of time-resolved x-ray magnetic circular dichroism (Tr-XMCD) and resonant x-ray scattering at a beamline BL07LSU in SPring-8 with a time-resolution of under 50 ps are presented. A micro-channel plate is utilized for the Tr-XMCD measurements at nearly normal incidence both in the partial electron and total fluorescence yield (PEY and TFY) modes at the L2,3 absorption edges of the 3d transition-metals in the soft x-ray region. The ultrafast photo-induced demagnetization within 50 ps is observed on the dynamics of a magnetic material of FePt thin film, having a distinct threshold of the photon density. The spectrum in the PEY mode is less-distorted both at the L2,3 edges compared with that in the TFY mode and has the potential to apply the sum rule analysis for XMCD spectra in pump-probed experiments.

7 pages, 5 figures

References in corpus (4)

• All-optical control of ferromagnetic thin films and nanostructures
• Generation of phase-matched circularly-polarized extreme ultraviolet high harmonics for magnetic circular dichroism spectroscopy
• Femtosecond X-ray magnetic circular dichroism absorption spectroscopy at an X-ray free electron laser
• Photoinduced demagnetization and insulator-to-metal transition in ferromagnetic insulating BaFeO${}_3$ thin films

Cited by in corpus (8)

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• Study of photoinduced valence dynamics in EuNi${}_2$(Si${}_{0.21}$Ge${}_{0.79}$)${}_2$ through time-resolved X-ray absorption spectroscopy
• Photo-induced Antiferromagnetic-ferromagnetic Transition and Electronic Structure Modulation in GdBaCo${}_2$O${}_{5.5}$ Thin Film
• Spin-orbital liquid in Ba${}_3$CuSb${}_2$O${}_9$ stabilized by oxygen holes
• Photo-induced phase transition on black samarium monosulfide
• Recent Progress in Ultrafast Dynamics of Transition-Metal Compounds Studied by Time-Resolved X-ray Techniques