Construction and development of a time-resolved x-ray magnetic circular dichroism-photoelectron emission microscopy system using femtosecond laser pulses at BL25SU SPring-8

Keiki Fukumoto, Tomohiro Matsushita, Hitoshi Osawa, Tetsuya Nakamura, Takayuki Muro, Kuniaki Arai, Takashi Kimura, Yoshichika Otani, Toyohiko Kinoshita

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number063903
JournalReview of Scientific Instruments
Volume79
Issue number6
DOIs
Publication statusPublished - 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation

Fingerprint Dive into the research topics of 'Construction and development of a time-resolved x-ray magnetic circular dichroism-photoelectron emission microscopy system using femtosecond laser pulses at BL25SU SPring-8'. Together they form a unique fingerprint.

Cite this