Effect of substrate temperature on structure, magnetic and electrical transport properties of Mn_1.60Ga films

Abstract L10-MnGa alloys have great application potential in the fields of permanent magnet and spintronics. L10-Mn1.60Ga thin films were prepared on MgO (100) substrates by magnetron sputtering under different substrate temperatures ranging from 200 to 600 °C, and the effect of the substrate temperature on the structure, magnetic and electrical transport properties of the films were observed. The results show that the films deposited at 300–600 °C substrate have good (001) orientation. The coercivity and effective anisotropy of film are enhanced at 400 °C substrate temperature, because the large tensile stress/strain induces a large coercivity and high effective anisotropy. When the substrate temperature increases to 500 °C, and the abnormal Hall resistivity of the film reaches the maximum value. The magnetic and electrical transport properties of the L10-Mn1.60Ga film are improved effectively with an appropriate substrate temperature.