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Theoretical Investigation of the Magnetic Order in FeAs

The magnetic structure of the iron monoarsenide FeAs is studied using ﬁrst-principlescalculations. We consider the collinear and non-collinear (spin-spiral wave) magnetic orderingand magnetic anisotropy. It is analitically shown that a magnetic triaxial anisotropy resultsin a sum of two spin-spiral waves with opposite directions of wave vectors and diﬀerent spinamplitudes, so that the magnetic moments in two perpendicular directions do not equal eachother.