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The role of current induced effective magnetic field in ultrathin magneticheterostructures is increasingly gaining interest since it can provideefficient ways of manipulating magnetization electrically. Two effects, knownas the Rashba spin orbit field and the spin Hall spin torque, have beenreported to be responsible for the generation of the effective field. However,quantitative understanding of the effective field, including its direction withrespect to the current flow, is lacking. Here we show vector measurements ofthe current induced effective field in Ta|CoFeB|MgO heterostructrures. Theeffective field shows significant dependence on the Ta and CoFeB layers'thickness. In particular, 1 nm thickness variation of the Ta layer can resultin nearly two orders of magnitude difference in the effective field. Moreover,its sign changes when the Ta layer thickness is reduced, indicating that thereare two competing effects that contribute to the effective field. The relativesize of the effective field vector components, directed transverse and parallelto the current flow, varies as the Ta thickness is changed. Our resultsillustrate the profound characteristics of just a few atomic layer thick metalsand their influence on magnetization dynamics.

Layer thickness dependence of the current induced effective field vector in Ta|CoFeB|MgO