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Magnetic heterostructure Mo/CoFeB/MgO has strong perpendicular magneticanisotropy and thermal stability. Through current-induced hysteresis loop shiftmeasurements, we show that the dampinglike spin-orbit torque (SOT) efficiencyof Mo/CoFeB/MgO heterostructure is $\xi_{DL}\approx -0.003\pm 0.001$ and fairlyindependent of the annealing temperature from 300$^\circ$C to 400$^\circ$C.Though $|\xi_{DL}|$ is small while compare to those from Ta or W-basedheterostructures, reversible current-induced SOT switching of athermally-stable Mo/CoFeB/MgO heterostruture can still be achieved.Furthermore, we observe field-free current-induced switching from aMo/CoFeB/MgO structure with the Mo layer being wedge-deposited. Our resultsindicate that even for a weak spin-orbit interaction 4d transition metal suchas Mo, it is still possible to generate sufficient spin current forconventional SOT switching and to realize field-free current-induced switchingby structural engineering.

The current-induced spin-orbit torque and field-free switching from Mo-based magnetic heterostructures