That really is small to use on its own. If you can find another one I would suggest you cut them into 6 or 8 pieces and make a 6 or 8 pole dual rotor.
If you can't find another one, cut into 8 and make an 8 pole single rotor with a rotating steel plate in place of the second rotor. I would space them further apart ( larger diameter) than in the picture.
If you overlap coils make the space between magnets half the width.
With 8 pole 6 coils side by side, make the gaps at least equal to the width.
Go for a cut in about 400rpm and you should get something useful out.
Flux