  Measurements of spin correlation in top quark pair production are presented
using data collected with the ATLAS detector at the LHC with proton-proton
collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated
luminosity of 4.6 fb$^{-1}$. Events are selected in final states with two
charged leptons and at least two jets and in final states with one charged
lepton and at least four jets. Four different observables sensitive to
different properties of the top quark pair production mechanism are used to
extract the correlation between the top and antitop quark spins. Some of these
observables are measured for the first time. The measurements are in good
agreement with the Standard Model prediction at next-to-leading-order accuracy.
