We report on a new strategy to use a X-ray 1/4 wave plate to convert linearly polarized X-rays into circularly polarized for efficient X-ray magnetic circular dichroism (XMCD) experiments. This instrumentation, unique in the world, combines the use of dispersive optics present at DXAS beamline of the LNLS and a phase plate with synchronous acquisition mode using a method know as Turbo-XAS. Using this setup, we have successfully generated 98% rate of circularly polarized X-rays with a diamond plate with the possibility to switch the helicity in up to 100 Hz synchronized by a lock-in acquisition. To characterize this state-of-art instrumentation we measured XMCD spectra of the ferromagnetic GdCo2 compound at Gd L3-edge and Co K-edge. Our results demonstrated an unprecedented improvement on the quality of the data provided by this new instrumentation when compared with the conventional scheme in the X-ray dispersive optics (polarization provided by the out-of-orbit dipole radiation).
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