Magnetism is the result of moving electrical charges - and such
movement will always result in a dipole.On the other hand, it has
indeed been considered, by some modern theories, that there might
be so-called "magnetic monopoles" - particles with only a north (or
south) magnetic "charge" but no such monopoles have been observed
so far. Perhaps the monopoles - should they exist - are too massive
to be created in particle accelerators, for example.