Optimization of the current pulse for spin-torque switches

Details Optimization of the current pulse for spin-torque switches Optimization of the current pulse for spin-torque switches

2011-02-09

arxiv.org/abs/1102.1904v3

Appl. Phys. Lett. 98, 143109 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1063/1.3576929

We address optimization of the spin current intensity profile needed to achieve spin torque switching of a nanomagnet. For systems with Ohmic dissipation we prove that the optimal current drives the magnetization along the trajectory, which is exact time-reversed replica of the relaxation trajectory towards the equilibrium. In practice it means that the optimal current is very nearly {\em twice} the minimal critical current needed to switch the magnet. Pulse duration of such an optimal current is a slow logarithmic function of temperature and the required probability of switching.

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