Time and Spatially Resolved Hard X-Ray MCD Measurement on a Co/Pt Multilayer Dot Excited by Pulsed RF Field

Nobuaki Kikuchi, Hitoshi Osawa, Motohiro Suzuki, Osamu Kitakami

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Understanding of magnetization behavior in magnetic nanostructures is a key issue for future magnetic/spintronic devices. Time-resolved X-ray magnetic circular dichroism (XMCD) is a powerful measurement technique with potential of nanometer spatial resolution, picosecond time resolution, and element selectivity. We have carried out time and spatially resolved XMCD microscopy measurement on a Co/Pt multilayer dot by detecting XMCD at the Pt L-{3} edge at BL39XU of SPring-8 using hard X-ray. Transient magnetic response of Co/Pt multilayer dots with diameter of 2.6~\mu \text{m} was investigated against pulsed RF field with frequency around 2.5 GHz and the maximum amplitude of about 400 Oe. By synchronizing excitation RF field pulse with X-ray pulses, the growth of magnetization precession of the induced Pt magnetic moment in the dot was clearly observed with sub-100 ps time resolution and submicrometer spatial resolution. The developed measurement setup can be applicable for a wide range of studies for time-resolved hard X-ray experiments.

Original languageEnglish
Article number8016610
JournalIEEE Transactions on Magnetics
Volume54
Issue number2
DOIs
Publication statusPublished - 2018 Feb

Keywords

  • Ferromagnetic resonance
  • X-ray magnetic circular dichroism (XMCD)
  • magnetization dynamics
  • spin waves

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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