I have classical source of current (40 V and 5 A).
How I can produce spin polarized current from classical DC current
while total length of my contacts is no more than 1 meter?
For clarify I want spin polarized current with amplitude of 10-50 mA.
Intriguing question, but probably with no good answer at usual scale (~1m). As we know, the average velocity of charge carriers, even in good metallic conductors, is of order of few mm/s. This is because they are scattered frequently and therefore quickly loose their polarization. So, to avoid this we may think about increasing their mean free path, i.e. their lifetime between consecutive scattering acts. Probably the easiest way to achieve this is to operate with electron beam in vacuum, just like in Stern-Gerlach experiment.
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