  Currently double-interface MTJs have been developed for enhancing the thermal
stability barrier in small technology node. Dzyaloshinskii-Moriya interaction
(DMI) inevitably exists in such devices due to the use of the
heavy-metal/ferromagnet structures. Previous studies have demonstrated the
detrimental effect of DMI on the conventional single-interface spin transfer
torque (STT) MTJs. Here in this work we will prove that the detrimental effect
of the DMI could be almost eliminated in the double-interface STT-MTJ. This
conclusion is attributed to the suppressing effect of the
Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction on the DMI. Detailed
mechanisms are analyzed based on the theoretical models and micromagnetic
simulation results. Our work highlights the importance of appropriately
controlling the DMI in two free layers of the double-interface STT-MTJ.
