Results of high-energy non-resonant magnetic X-ray diffraction experiments performed on the model system MnF2 at a photon energy of 80 keV are presented. A surprisingly high peak intensity of the magnetic 300 reflection of 13 000 photons s-1 in the three-crystal mode and 19 000 Photonss-1 in the two-crystal mode, with a peak-to-background ratio of 230:1 and 10:1, respectively, has been achieved. At 80 keV, the penetration depth is 7mm. When the path length of the beam through the crystal is varied, the effect of volume enhancement of the intensity diffracted by magnetic reflections is demonstrated. The Q dependence of the magnetic and the charge Bragg reflections has been measured and agrees well with theory. The measurement of the temperature dependence of the sublattice magnetization allows a very accurate determination of the critical exponent β = 0.333 (3) and the Néel temperature TN = 67.713 (2) K. Finally, the multiple charge scattering is discussed, which is very pronounced for the magnetic reflections of MnF2.
|Number of pages||12|
|Journal||Acta Crystallographica Section A: Foundations of Crystallography|
|State||Published - 1 May 1996|