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A versatile X‐ray phase retarder for lock‐in XMCD measurements

Poldi, Eduardo H. T. ; Escanhoela Jr, Carlos A. ; Fonseca Jr, Jairo ; Eleotério, Marcos A. S. ; dos Reis, Ricardo D. ; Lang, Jonathan C. ; Haskel, Daniel ; Souza-Neto, Narcizo M.

Journal of synchrotron radiation, 2020-09, Vol.27 (5), p.1240-1246 [Periódico revisado por pares]

5 Abbey Square, Chester, Cheshire CH1 2HU, England: International Union of Crystallography

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  • Título:
    A versatile X‐ray phase retarder for lock‐in XMCD measurements
  • Autor: Poldi, Eduardo H. T. ; Escanhoela Jr, Carlos A. ; Fonseca Jr, Jairo ; Eleotério, Marcos A. S. ; dos Reis, Ricardo D. ; Lang, Jonathan C. ; Haskel, Daniel ; Souza-Neto, Narcizo M.
  • Assuntos: Circular polarization ; Dichroism ; Helicity ; instrumentation ; lock-in ; Magnetic properties ; magnetism ; Material properties ; NUCLEAR PHYSICS AND RADIATION PHYSICS ; phase retarder ; Selectivity ; Switching ; Wave plates ; Waveforms ; X-ray spectroscopy ; XAS ; XMCD
  • É parte de: Journal of synchrotron radiation, 2020-09, Vol.27 (5), p.1240-1246
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    Brazilian Ministry of Science, Technology and Innovation (MCTI)
    AC02-06CH11357
    USDOE
  • Descrição: X‐ray magnetic circular dichroism (XMCD) is a technique commonly used to probe magnetic properties of materials with element and orbital selectivity, which requires the use of circularly polarized (CP) X‐rays. It is possible to accomplish XMCD experiments with fixed CP and alternating the magnetic field orientation, but most reliable data are obtained when alternating the magnetization orientation and the polarization between right and left helicities. A versatile strategy has been developed to perform XMCD experiments using a hard X‐ray quarter‐wave plate, at both polychromatic dispersive and conventional monochromatic optics, in combination with synchronous data acquisition. The switching frequency waveform is fed into a lock‐in amplifier to detect and amplify the XMCD signal. The results on a reference sample demonstrate an improvement in data quality and acquisition time. The instrumentation successfully generated 98% of CP X‐rays switching the beam helicity at 13 Hz, with the possibility of faster helicity switching once it is installed at the new Brazilian fourth‐generation source, SIRIUS. A versatile strategy to perform efficient X‐ray magnetic circular dichroism experiments with a quarter‐wave plate using a setup that combines non‐conventional dispersive optics with locked‐in acquisition, also compatible with monochromatic X‐ray beamlines and large magnets, is reported.
  • Editor: 5 Abbey Square, Chester, Cheshire CH1 2HU, England: International Union of Crystallography
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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