Voltage Asymmetry of Spin-Transfer Torques
Supriyo Datta Research Group
This resource belongs to the Supriyo Datta Research Group group.
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.
IEEE Trans on Nanotechnology, vol. 11, pp. 261-272 (2012) doi: 10.1109/TNANO.2011.2163147
Researchers should cite this work as follows:
Deepanjan Datta; Behtash Behin-Aein; Sayeef Salahuddin; Supriyo Datta (2013), "Voltage Asymmetry of Spin-Transfer Torques," http://nanohub.org/resources/19263.