ATLAS measurements of CP violation with beauty mesons

The ATLAS experiment has performed measurements of mixing and CP violation in the neutral B meson systems. This talk will focus on the latest results from the ATLAS collaboration on CP violation in the $B_s^0 \rightarrow J/\psi \phi$ decays. Standard Model predicts the CP violating mixing phase, $\phi_s$, to be very small and its SM value is very well constrained, while in many new physics models large $\phi_s$ values are expected. Latest measurements of $\phi_s$ and several other parameters describing the $B_s^0 \rightarrow J/\psi \phi$ decays will be reported.