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Spin-orbit torque can drive electrical switching of magnetic layers. Here, wereport that at least for micrometer-sized samples there is no simplecorrelation between the efficiency of dampinglike spin-orbit torque({\xi}_DL^j) and the critical switching current density of perpendicularlymagnetized spin-current generator/ferromagnet heterostructures. We find thatthe values of {\xi}_DL^j based on switching current densities can either under-or over-estimated {\xi}_DL^j by up to tens of times in a domain-wall depinninganalysis, while in the macrospin analysis based on the switching currentdensity {\xi}_DL^j can be overestimated by up to thousands of times. Whencomparing the relative strengths of {\xi}_DL^j of spin-current generators, thecritical switching current densities by themselves are a poor predictor.

physical review applied

Lack of simple correlation between switching current density and  spin-orbit torque efficiency of perpendicularly magnetized spin-current  generator/ferromagnet heterostructures