Yes, magnets can be stacked and this can sometimes be a good solution if you need a magnet in a size that is not available. Before stacking magnets, you should be aware of the following:
- The magnets should have the same diameter/width. It's best to stack magnets that are the same.
- A good rule of thumb is that the strength of the stack increases with the strength of the magnet added to the stack. This rule applies as long as the stack height is no higher than half the diameter of the magnets. If stacked higher than half the diameter of the magnets, each new magnet will add less and less strength to the overall strength of the stack.
- A magnet stack is 95% equivalent to a ‘whole magnet’ of the same size. Small deviations in the magnetic field are to be expected due to alloys and small irregularities, but in practice it is doubtful that it will be noticeable.