Hi there, ok, I'll try to keep this short.
Answer to your first ?, no they don't exist. Having a true unipolar magnet is impossible. Magnets are powered by the opposing forces. It would be like clapping with one hand.....
There is a lot of "theoretical" stuff out there about monopole magnets though. Invent one and you'll be rich.
As far as the homo, uni, they all refer to the same non existant type of magnet.
A mono-polar magnet is confusing as it is still a 2 pole magnet but set up in such a way as to utilize one of the fields more than the other. See link....
There is such a thing as a homo-polar generator and motor though........
BotXXXXX XXXXXne, all magnets have 2 poles.
Hope this helps you,
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