It's a random thought I had. Let's say you have a single perfect permanent magnet. There is just one magnetic domain, and the magnet is cut so that its magnetic moment is along a single crystal axis. For example, we can imagine a cube shaped magnet, with the magnetic moment pointing straight out the top face. My question is this: Has there been any experiment, where one rapidly spins such a magnet along the axis defined by its magnetic moment, and sees a measurable change in the magnitude of the magnetic field? Now I know you couldn't completely cancel out a permanent magnet just by spinning. The speeds needed would cause the magnet to fly apart. My question is whether any measured change in the magnetic moment has been shown, purely due to rotation. This would be a reversible change, since you could just stop the magnet spinning and see the field as it was before. Thoughts?