Abstract

We have studied the L10 ordering of FePtB layers assisted by the oxidation-induced stress of a capping layer. In the thermally oxidized Si substrate/MgO/CoFeB/FePtB/Ti structure, the oxidation of the Ti capping layer during post-deposition annealing exerts an in-plane tensile stress on the FePtB layer, which promotes L10 ordering of the FePtB layer. The diffusion of boron from the FePtB layer into the Ti layer also plays a crucial role in the L10 ordering. The CoFeB/FePtB composite layers can be used for the top electrode of perpendicular magnetic tunnel junctions.

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