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Here, we present a combination of magnetization and magnetic torqueexperiments to investigate the magnetic orders in undoped EuFe2As2 and Co dopedEuFe1.8Co0.2As2 single crystals. Although at low temperatures typical resultsfor an antiferromagnetic (AFM) state in EuFe2As2 were found, our data stronglyindicate the occurrence of a canted antiferromagnetic (C-AFM) order of the Eu2+moments between 17 K and 19 K, observed even in the lowest studied magneticfields. However, unlike in the parent compound, no low-field andlow-temperature AFM state of the Eu^2+ moments was observed in the dopedEuFe1.8Co0.2As2. Only a C-AFM phase is present at low fields and lowtemperatures, with a reduced magnetic anisotropy as compared to the undopedsystem. We present and discuss for both, EuFe2As2 and EuFe1.8Co0.2As2, theexperimentally deduced magnetic phase diagrams of the magnetic ordering of theEu^2+ sublattice with respect to the temperature, the applied magnetic field,and its orientation to the crystallographic axes. It is likely that themagnetic coupling of the Eu and the Fe sublattice is strongly depending on Codoping, having detrimental influence on the magnetic phase diagrams asdetermined in this work. Their impact on the occurrence of superconductivitywith higher Co doping is discussed.

physical review. b, condensed matter and materials physics

Study of the anisotropic magnetic order of the Eu sublattice in single  crystals of EuFe_2-xCo_xAs_2 (x = 0, 0.2) by means of magnetization and  magnetic torque