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We present an {\it ab-initio} study of the spin-transfer torque in aFe/MgO/FePt/Fe magnetic tunnel junctions. We consider a FePt film with athickness up to six unit cells, either in direct contact with the MgO spacer orwith an intercalated ultra-thin Fe seed layer. We find that in the FePt layerthe torque is not attenuated as strongly as in the case of pure Fe. Moreover,in FePt the torque alternates sign at the Fe and Pt atomic planes throughoutthe stack for all FePt thicknesses considered. Finally, when Fe is intercalatedbetween MgO and L$1_0$-FePt, the torque is sharply attenuated and it istransferred to FePt only for a Fe seed layer that is less thantwo-atomic-planes thick. We attribute these features to the different spatialprofiles of the exchange and correlation field and the induced non-equilibriumspin accumulation. The calculated tunnelling magneto-resistance of theFe/MgO/FePt/Fe junctions studied is enhanced with respect to the one ofFe/MgO/Fe, while it is reduced with Fe intercalation. Our work shows thatL$1_0$-FePt junctions can be promising candidates for current-operated magneticdevices and that the magnetic texture at the atomic scale has an importanteffect on the spin transfer torque.

Non-trivial spatial dependence of the spin torques in L1$_0$ FePt-based tunnelling junctions