Tuning the magnetism of L10-MnGa films by Pt doping

Abstract L10-MnGa alloy films have attracted much attention for application of spin-transfer torque magnetic random access memories. Here we present the first report of the structure, magnetic and electrical transport properties of L10-MnGa films doped with Pt. It is found that L10-MnGa films have (0 0 1) orientation for 5% Pt-doped, and show (1 1 0) orientation for 10% and above Pt-doped. The out-of-plane coercivities increase, both the saturation magnetization and the magnetic anisotropy decrease monotonously with increasing Pt composition. By increasing Pt composition, L10-MnGa films change from ferromagnetic to paramagnetic property. The results of Hall effect measurement also confirm the change in magnetism. The experimental results are meaningful to open up new ideas for the design and application of spintronics devices.