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5Â¥: Originally posted by hookhans at 2013-03-15 09:01:58
1)        In such circumstances, the conductance is quantized with the unit 2e2/h for the non-magnetic materials. However, the unit for the magnetic materials should be e2/h due to lifting of the spin degen ...

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And the conductance is quantized in units 2e2/h for non-magnetic materials and in units e2/h for magnetic materials in which the exchange interaction lifts the spin degeneracy. Recent experiments performed on Ni ballistic nanocontacts found a change of sign in the magnetoresistance obtained for the field parallel and perpendicular to the current. This behavior was interpreted and signature of AMR


The ballistic conductance is given by G=Ne2/h, where N is the number of open conducting channels. This quantity is affected by the spin-orbit interaction which is known to be much stronger in open and constrained geometries than in bulk materials. The effect is anisotropic because the orbital momentum is coupled to the spin causing its projection to be different depending on the magnetization direction. By changing the magnetization direction one can, therefore, change the number of bands crossing the Fermi energy and thereby affect the ballistic conductance.
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