A 2.3 to 25 keV XAS beamline at LNLS

Tolentino, H.C.N.; Ramos, A.Y.; Alves, M.C.M.; Barrea, R.A.; Tamura, E.; Cezar, J.C.; Watanabe, N.

doi:10.1107/S0909049501005143

Figure 8
(a) Normalized Co K-edge spectrum and its derivative, which is equal, at the edge, to δμx/δE ≃ 0.1 eV⁻¹. An energy scale fluctuation of δE ≃ 10 meV generates a signal of the order of 10⁻³ of the total jump, comparable with a typical XMCD signal. (b) Data-collection strategy: one measures the result of four successive measurements (Δμ⁺ = μ⁺ − μ⁻ − μ⁻ + μ⁺) at each energy point (μ⁺ and μ⁻ represent each magnetic field orientation, parallel or anti-parallel to the propagation of the beam), then repeats the measurement, starting with opposite orientation (Δμ⁻ = μ⁻ − μ⁺ − μ⁺ + μ⁻), and finally takes the XMCD signal as the difference Δμ_XMCD = Δμ⁺ − Δμ⁻. Even when collecting the XMCD signal point-by-point, a derivative-like signal shows up in each orientation.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 8| Part 3| May 2001| Pages 1040-1046

doi:10.1107/S0909049501005143

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