Contribution of the magnetic anisotropy to the current induced spin-orbit effective fields in the in-plane magnetized ferromagnetic metal and heavy metal multilayers

摘要

The second-order planar Hall effect is an easy and effective method for the effective fields of current induced spin-orbit torque (SOT) in the in-plane magnetized ferromagnetic metal and heavy metal multilayers. Here, we report a simulation on this method by using the Stoner-Wohlfarth model. For NiFe/Pt, the experimental results are well fitted by our model. As for Pt/NiFe/Pt, it is found a strong magnetic anisotropy cannot be neglected. The contribution of magnetic anisotropy to the SOT-induced effective fields is further analyzed. Our results give us a better understanding of the SOT in such multilayers.