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

Abstract

Switching diagrams of nanoscale ferromagnets driven by a spin-transfer torque are studied in the macrospin approximation. We consider a disk-shaped free layer with in-plane easy axis and external magnetic field directed in-plane at 90 degrees to that axis. It is shown that this configuration is sensitive to the angular dependence of the spin-transfer efficiency factor and can be used to experimentally distinguish between different forms of $g(\theta )$, in particular between the original Slonczewski form and the constant $g$ approximation. The difference in switching diagrams is especially pronounced at large spin polarizations, with the Slonczewski case exhibiting an anomalous region.

3 pages, 4 figures

References in corpus (2)

• Generation of microwave radiation in planar spin-transfer devices
• Current-controlled magnetization dynamics in the spin-flip transistor