TY - JOUR
T1 - Construction and development of a time-resolved x-ray magnetic circular dichroism-photoelectron emission microscopy system using femtosecond laser pulses at BL25SU SPring-8
AU - Fukumoto, Keiki
AU - Matsushita, Tomohiro
AU - Osawa, Hitoshi
AU - Nakamura, Tetsuya
AU - Muro, Takayuki
AU - Arai, Kuniaki
AU - Kimura, Takashi
AU - Otani, Yoshichika
AU - Kinoshita, Toyohiko
N1 - Funding Information:
We are grateful to Masahiro Higashiyama for help in constructing the laser system. The participation of K.A is indebted to Professor A. Kakizaki, University of Tokyo. We also thank Dr. Y. Tanaka and Dr. T. Ohshima installing the delay generator to our laser system. The contribution by Dr. K. Kobayashi (NIMS) for introducing the PEEM system to SPring-8 is acknowledged. This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (S, 18101004).
PY - 2008
Y1 - 2008
N2 - A femtosecond pulsed laser system has been installed at the BL25SU soft x-ray beamline at SPring-8 for time-resolved pump-probe experiments with synchronization of the laser pulses to the circularly polarized x-ray pulses. There are four different apparatuses situated at the beamline; for photoemission spectroscopy, two-dimensional display photoelectron diffraction, x-ray magnetic circular dichroism (XMCD) with electromagnetic coils, and photoelectron emission microscopy (PEEM). All four can be used for time-resolved experiments, and preliminary investigations have been carried out using the PEEM apparatus to observe magnetization dynamics in combination with XMCD. In this article, we describe the details of the stroboscopic pump-probe XMCD-PEEM experiment, and present preliminary data. The repetition rate of the laser pulses is set using a pulse selector to match the single bunches of SPring-8's hybrid filling pattern, which consists of several single bunches and a continuous bunch train. Electrons ejected during the bunch train, which do not provide time-resolved signal, are eliminated by periodically reducing the channel plate voltage using a custom-built power supply. The pulsed laser is used to create 300 ps long magnetic field pulses, which cause magnetic excitations in micron-sized magnetic elements which contain magnetic vortex structures. The observed frequency of the motion is consistent with previously reported observations and simulations.
AB - A femtosecond pulsed laser system has been installed at the BL25SU soft x-ray beamline at SPring-8 for time-resolved pump-probe experiments with synchronization of the laser pulses to the circularly polarized x-ray pulses. There are four different apparatuses situated at the beamline; for photoemission spectroscopy, two-dimensional display photoelectron diffraction, x-ray magnetic circular dichroism (XMCD) with electromagnetic coils, and photoelectron emission microscopy (PEEM). All four can be used for time-resolved experiments, and preliminary investigations have been carried out using the PEEM apparatus to observe magnetization dynamics in combination with XMCD. In this article, we describe the details of the stroboscopic pump-probe XMCD-PEEM experiment, and present preliminary data. The repetition rate of the laser pulses is set using a pulse selector to match the single bunches of SPring-8's hybrid filling pattern, which consists of several single bunches and a continuous bunch train. Electrons ejected during the bunch train, which do not provide time-resolved signal, are eliminated by periodically reducing the channel plate voltage using a custom-built power supply. The pulsed laser is used to create 300 ps long magnetic field pulses, which cause magnetic excitations in micron-sized magnetic elements which contain magnetic vortex structures. The observed frequency of the motion is consistent with previously reported observations and simulations.
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U2 - 10.1063/1.2937648
DO - 10.1063/1.2937648
M3 - Article
C2 - 18601413
AN - SCOPUS:46449119537
SN - 0034-6748
VL - 79
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 6
M1 - 063903
ER -