That's a trick question. Spin is a characteristic of some elementary particles. It is like asking, what provides the energy for the electron to have mass or charge. If an electron did not have a spin...
Particles (small size i.e. size of about 10-10m or less) which form an element or compound i.e. "Atoms" or "Molecules" are reffered to as "Elementary Particles". Basically the term is referred to...
If you mean fundamental particles, I have bad news for you, they actually don't spin, well at least not like how you're probably thinking of it, e.g. like a basketball on a Globetrotter's finger. In...