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We report modulated switching current density and spin-orbit torques (SOT) in MnGa/Ta films with inserting very thin Co 2 FeAl and Co layers. Ferromagnetic coupling has been found in MnGa/Co 2 FeAl/Ta, resulting in a decreased effective anisotropy field. On the contrary, in MnGa/Co/Ta, antiferromagnetic coupling plays a dominant role. The switching current density   J    c   in MnGa/Ta is 8.5 × 10 7  A/cm 2 . After inserting 0.8-nm-thick Co 2 FeAl and Co, the  J    c   becomes 5 × 10 7  A/cm 2  and 9 × 10 7  A/cm 2 , respectively. By performing adiabatic harmonic Hall voltage measurements, it is demonstrated that the inserted Co 2 FeAl layer has mainly enhanced the field-like torques, while in MnGa/Co/Ta the damping-like torques have been enhanced. Finally, the enhanced spin Hall effect (SHE) has also been studied using the spin Hall magnetoresistance measurement. The modulated   J    c   and SOT are ascribed to the combination of magnetic coupling, Rashba effect and SHE at the interfaces.

Modulated switching current density and spin-orbit torques in MnGa/Ta films with inserting ferromagnetic layers