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In this work, fabrication and characterization of magnetic properties ofEuFe2As2 and EuRbFe4As4 single crystals is reported. Magnetization measurementsof samples with well defined thin film geometry and crystal orientationdemonstrate a striking similarity in ferromagnetic properties of Eu subsystemsin these two compounds. Measurements with magnetic field applied along abcrystal planes reveal meta-magnetic transition in both compounds. Numericalstudies employing the Jz1-Jz2 Heisenberg model suggest that the ground state ofthe magnetic order in Eu subsystem for both compounds is the helical spin orderwith the helical angle about 2pi/5, while the meta-magnetic transition is thehelix-to-fan first order phase transition.

Helical spin order in EuFe2As2 and EuRbFe4As4 single crystals