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Two recent developments in XMCD.

F Baudelet1, J M Dubuisson, C Hébert

  • 1LURE, Bâtiment 209d, 91405 Orsay CEDEX, France.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary
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This study introduces novel sample environments for X-ray magnetic circular dichroism (XMCD) experiments, enabling high-pressure measurements up to 30 GPa and fast-switching magnetic fields for paramagnetic compounds.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • X-ray Magnetic Circular Dichroism (XMCD) is a powerful technique for probing magnetic properties.
  • Standard XMCD measurements face challenges under extreme conditions like high pressure or with weakly magnetic materials.

Purpose of the Study:

  • To develop advanced sample environments for XMCD.
  • To enable XMCD measurements under high pressures (up to 30 GPa).
  • To implement a fast-switching magnetic field system for sensitive XMCD detection.

Main Methods:

  • Development of a high-pressure cell compatible with XMCD.
  • Design and implementation of a novel superconducting device for rapid magnetic field modulation.
  • Utilizing a series of acquisitions with alternating magnetic fields to enhance signal-to-noise ratio.

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Main Results:

  • Successful XMCD measurements were performed under pressures up to 30 GPa.
  • A new superconducting system achieved fast magnetic field switching (11 s) up to 6 T.
  • Demonstrated improved signal-to-noise ratio for XMCD on paramagnetic rare-earth compounds at 4.5 K.

Conclusions:

  • The developed techniques significantly expand the applicability of XMCD to new experimental regimes.
  • These advancements facilitate the study of magnetic phenomena under high pressure and for weakly magnetic systems.
  • The fast-switching field method is crucial for detecting small XMCD signals in paramagnetic materials.