HELLO!!
We all know that TMR=(Gp-Gap)/Gap=(Ip-Iap)/Iap. I calculated the TMR of our model refering to the tutorial:spin transport in Fe-MgO-Fe.
I also calculate the TMR through the currents, through the equation, TMR=(Ip-Iap)/Iap (the currents are also calculated by ATK), but the results of this two calculations are extremely different!!
For example, in 1.5V, the TMR through the method TMR=(Gp-Gap)/Gap is positive, however, the TMR through (Ip-Iap)/Iap is negtive!
This result really confuses me!! In my opinion, these two results should be corresponding.
Waiting for you answer.......