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Switching diagrams of nanoscale ferromagnets driven by a spin-transfer torqueare studied in the macrospin approximation. We consider a disk-shaped freelayer with in-plane easy axis and external magnetic field directed in-plane at90 degrees to that axis. It is shown that this configuration is sensitive tothe angular dependence of the spin-transfer efficiency factor and can be usedto experimentally distinguish between different forms of $g(\theta)$, inparticular between the original Slonczewski form and the constant $g$approximation. The difference in switching diagrams is especially pronounced atlarge spin polarizations, with the Slonczewski case exhibiting an anomalousregion.

Anomalous stabilization in a spin-transfer system at high spin polarization