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

Kou Takubo; Kohei Yamamoto; Yasuyuki Hirata; Yuichi Yokoyama; Yuya Kubota; Shingo Yamamoto; Susumu Yamamoto; Iwao Matsuda; Shik Shin; Takeshi Seki; Koki Takanashi; Hiroki Wadati

doi:10.1063/1.4981769

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

Kou Takubo, Kohei Yamamoto, Yasuyuki Hirata, Yuichi Yokoyama, Yuya Kubota, Shingo Yamamoto, Susumu Yamamoto, Iwao Matsuda, Shik Shin, Takeshi Seki, Koki Takanashi, Hiroki Wadati

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

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 in both the partial electron and total fluorescence yield (PEY and TFY) modes at the L_2,3 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 films, having a distinct threshold of the photon density. The spectrum in the PEY mode is less-distorted at both the L_2,3 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.

Original language	English
Article number	162401
Journal	Applied Physics Letters
Volume	110
Issue number	16
DOIs	https://doi.org/10.1063/1.4981769
Publication status	Published - 2017 Apr 17

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4981769

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title = "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 in both 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 films, having a distinct threshold of the photon density. The spectrum in the PEY mode is less-distorted at both 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.",

author = "Kou Takubo and Kohei Yamamoto and Yasuyuki Hirata and Yuichi Yokoyama and Yuya Kubota and Shingo Yamamoto and Susumu Yamamoto and Iwao Matsuda and Shik Shin and Takeshi Seki and Koki Takanashi and Hiroki Wadati",

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doi = "10.1063/1.4981769",

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AU - Takubo, Kou

AU - Yamamoto, Kohei

AU - Hirata, Yasuyuki

AU - Yokoyama, Yuichi

AU - Kubota, Yuya

AU - Yamamoto, Shingo

AU - Yamamoto, Susumu

AU - Matsuda, Iwao

AU - Shin, Shik

AU - Seki, Takeshi

AU - Takanashi, Koki

AU - Wadati, Hiroki

PY - 2017/4/17

Y1 - 2017/4/17

N2 - 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 in both 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 films, having a distinct threshold of the photon density. The spectrum in the PEY mode is less-distorted at both 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.

AB - 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 in both 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 films, having a distinct threshold of the photon density. The spectrum in the PEY mode is less-distorted at both 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.

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

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