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In this paper, we present the results of our study into current-induced spin-orbit torque (SOT) switching in perpendicularly magnetized CoGa/MnGa/Pt trilayers with different thicknesses of MnGa and Pt. The SOT switching was observed for all films that undergo Joule heating. We also investigate SOT switching in the bottom (CoGa)/MnGa/top(CoGa/Pt) films with different top layers. Although both the bottom and top layers contribute to the SOT, the relative magnitudes of the switching current densities J(C) in the top and bottom layers indicate that the SOT is dominant in the top layer. The J(C) as a function of thickness is discussed in terms of the magnetic properties and resistivity. Experimental data suggested that the MnGa thickness dependence of J(C) may originate from the perpendicular magnetic anisotropy thickness product K-u(eff) t value. On the other hand, J(C) as a function of the Pt thickness shows weak dependence. This may be attributed to the slight change of spin-Hall angle theta(SH) value with different thicknesses of Pt, when we assumed that the SOT switching is primarily due to the spin-Hall effect. (C) 2018 Elsevier B.V. All rights reserved.
