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75As NMR measurements were performed as a function of temperature and dopingin (Eu1-xKx)Fe2As2 (x=0,0.38,0.5,0.7) samples. The large Eu2+ moments and theirfluctuations are found to dominate the 75As NMR properties. The 75As nucleiclose to the Eu2+ moments likely have a very short spin-spin relaxation time(T2) and are wiped out of our measurement window. The 75As nuclei relativelyfar from Eu2+ moments are probed in this study. Increasing the Eu contentprogressively decreases the signal intensity with no signal found for thefull-Eu sample (x=0). The large 75As NMR linewidth arises from an inhomogeneousmagnetic environment around them. The spin lattice relaxation rate (1/T1) forx=0.5 and 0.7 samples is nearly independent of temperature above 100K andresults from a coupling to paramagnetic fluctuations of the Eu2+ moments. Thebehavior of 1/T1 at lower temperatures has contributions from theantiferromagnetic fluctuations of the Eu2+ moments as also the fluctuationsintrinsic to the FeAs planes and from superconductivity.

75As NMR local probe study of magnetism in (Eu1-xKx)Fe2As2