Highlights of top-quark properties measurements at ATLAS

The top-quark is a fundamental particle of the Standard Model (SM) and plays an important role in Beyond the SM (BSM) scenarios. It is hence important to measure its properties precisely, to reduce uncertainties on SM prediction and to constraint BSM models. The latest top-quark properties measurements performed by the ATLAS collaboration is presented. Precise measurements of the top-quark mass, top-quark width and structure of the $Wtb$ interaction vertex, using the 8 TeV dataset, are reported. First results studying the 13 TeV dataset are also presented, which include searches for Flavour Changing Neutral Currents and measurements of the spin correlations and colour flow in $t \bar{t} $ events.