  We report muon spin relaxation/rotation (uSR) measurements of single crystal
Ba(Fe1-xCox)2As2 with x=0.038 and 0.047. Zero field (ZF)-uSR and Transverse
field (TF)-iSR measurements of these underdoped samples find the presence of
magnetism and superconductivity. We find internal fields along the c-axis whose
magnitude decreases with increasing doping. We find evidence for a
low-temperature volume fraction that is only weakly magnetic, where that volume
fraction increases with increasing Co doping of the sample. TF-uSR measurements
show slight changes in the spectra that indicate magnetic inhomogeneities due
to the loss of Fe moments in the system, the effect of which is larger in the
higher Co doping. We discuss the existence of superconductivity in these
samples in close proximity to strong magnetic order.
