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Voltage Asymmetry of Spin-Transfer Torques

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4 Author(s)
Datta, D. ; Dept. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA ; Behin-Aein, B. ; Datta, Supriyo ; Salahuddin, Sayeef

Experimentally, it is seen that the free magnetic layer of a spin torque transfer (STT) device experiences a larger in-plane torque when a negative (rather than positive) voltage is applied to the fixed layer. This is surprising because magnets do not have any intrinsic asymmetry. In this paper, we 1) provide a simple physical explanation, based on the polarization of fixed layer in the energy range of transport; 2) extend it to explain the asymmetric bias dependence of out-of-plane torque as observed in some of the experiments; and 3) propose an asymmetric STT structure that can lead to a significant difference in the in-plane torques exerted on two contacts, even if they are identical. This effect 3 has not been observed to our knowledge and if demonstrated can find important applications.

Published in:

Nanotechnology, IEEE Transactions on  (Volume:11 ,  Issue: 2 )

Date of Publication:

March 2012

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