Chen, T.-Y.T.-Y.ChenChan, H.-I.H.-I.ChanLiao, W.-B.W.-B.LiaoCHI-FENG PAI2020-05-122020-05-122018https://scholars.lib.ntu.edu.tw/handle/123456789/491150Magnetic heterostructure Mo/Co-Fe-B/MgO has strong perpendicular magnetic anisotropy and thermal stability. Through current-induced hysteresis loop shift measurements, we show that the damping-like spin-orbit torque (SOT) efficiency of Mo/Co-Fe-B/MgO heterostructures is ξDL≈-0.003±0.001 and is fairly independent of the annealing temperature from 300 °C to 400 °C. Although |ξDL| is small compared to those from Ta-or W-based heterostructures, reversible current-induced SOT switching of a thermally stable Mo/Co-Fe-B/MgO heterostruture can still be achieved. Furthermore, we observe field-free current-induced switching from a Mo/Co-Fe-B/MgO structure with the Mo layer being wedge-deposited. Our results indicate that even for a weak spin-orbit interaction 4d transition metal such as Mo, it is still possible to generate sufficient spin current for conventional SOT switching and to realize field-free current-induced switching by structural engineering.journal article10.1103/PhysRevApplied.10.0440382-s2.0-85054819653https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054819653&doi=10.1103%2fPhysRevApplied.10.044038&partnerID=40&md5=16394d390dfead73d71af3b30a9023f6