My understanding is that spin angular momentum is just as real as bulk angular momentum. So, if we get the spin of some electrons in an object to flip, then the object should start spinning in the opposite direction to conserve angular momentum. Right? If we mount a permanent magnet in an external magnetic field in such a way as to allow the magnet to rotate along the field direction, and allow the magnet to align with the external field, and let the magnet come to rest, then reverse the polarity of the external magnetic field. Then, the magnet should start turning, right? Or, if we heat up the magnet past the Curie point, we should see some change in bulk rotation, right?