How to get Resistance-Area(RA) of MRAM by using ATK

[broadcome]

Dear all,

In toturial document "First principles modelling of Electron transport across interfaces",
there are two main paramener of MRAM - TMR and RA.
It is easy to calculate TMR by using script of toturial.

Is there simple method or script to get RA?



I would be extremely grateful for your reply.
Best regards,

[Anders Blom]

Yes, it's quite simple really. R is the inverse of the conductivity and A is the device area. So, if we let "a" be the size of the unit cell,

RA = a**2 / (cond_up+cond_down)

One should be a little bit careful since the conductivity doesn't actually change if we double the unit cell in XY (because we are computing the conductance, not the conductivity), but RA would in the formula above. Thus we should interpret "R" as "per unit cell", and therefore "a" should correspond to the minimal unit cell.

[broadcome]

Wow!
Very quick answer.

Thanx!!!