Abstract
Magnetic resonant x-ray scattering experiments have been performed on a single crystal of ${\text{EuFe}}_{2}{\text{As}}_{2}$ at the $\text{Eu}\text{ }{L}_{3}$ absorption edge. The orientation of Eu magnetic moments was directly determined: in the antiferromagnetic (AFM) ordered phase they lay parallel to the crystallographic $a$ axis. In addition, nonresonant magnetic x-ray measurements indicate that Fe magnetic moments are aligned along the same direction in the spin-density-wave phase. As deduced by temperature dependence of integrated intensities, the Fe magnetic arrangement seems to be insensitive to the onset of Eu AFM phase. Some speculations on the low-temperature space group are reported on the base of detected resonant reflections on forbidden Bragg positions.
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