methods used for spin transport measurements

[hellboy]

What method (or methods) is used to perform spin transport in MTJs, particularly interested in knowing

(i) coherent transport models for the spin transport
(ii) and the use of full-wave numerical simulation in spin transport.
(iii) how the doping is taken into account in  modeling spin transport (i.e., coherent transport in presence of doping in graphene)

Thanks in advance.

[hellboy]

Any suggestions ?

[Jess Wellendorff]

The theoretical foundation of DFT electron transport calculations using ATK  is pretty well covered in a scientific paper (http://journals.aps.org/prb/abstract/10.1103/PhysRevB.65.165401) as well as the ATK reference manual (http://www.quantumwise.com/documents/manuals/latest/ReferenceManual/index.html/chap.negf.html).

We use the non-equilibrium Greens function method, also for the case of spin transport. Several examples of this are available of tutorials on spintronics calculations, including MTJs (http://quantumwise.com/publications/tutorials/itemlist/category/95-spintronics).

Doping is easily handled by adding or removing background charge. This modifies the external potential acting on the Kohn-Sham one-electron states. See "http://quantumwise.com/publications/tutorials/item/820-ni-silicide-si-interfaces" and "http://quantumwise.com/documents/manuals/latest/ReferenceManual/index.html/ref.atomiccompensationcharge.html" for more info.

Hope this helps.

- Jess