I see. So the real problem is density? There's a company here that is developing 4Gbit pS-MRAM modules on a 65 nm node: http://www.mram-info.com/updates-sping

I see. So the real problem is density? There's a company here that is developing 4Gbit pS-MRAM modules on a 65 nm node: http://www.mram-info.com/updates-spingate-working-4gbit-ps-mram-chip-design http://www.mram-info.com/updates-spingate-working-4gbit-ps-m... What does it mean when the article says a "cell size of 4F^2 in 2D configuration"?