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

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

2009-06-24

arxiv.org/abs/0906.4566v1

J. Appl. Phys. 105, 07D114 (2009)

Physics

Condensed Matter

Materials Science

3 pages, 4 figures

Scientific paper

10.1063/1.3067853

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.

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