What does the term anisotropic mean?
A magnet is called anisotropic when all of its magnetic domains are aligned in the same direction. This is achieved during the manufacturing process and ensures that the domains are 100% aligned in the same direction to deliver maximum magnetic performance. This direction is called the 'magnetic axis'.
The alignment is achieved by exposing each magnet to a strong electromagnetic field at a critical point during manufacturing, which then "locks" the domains parallel to the applied electromagnetic field.
An anisotropic magnet can only be magnetized in the direction set during manufacturing (along its magnetic axis). Attempts to magnetize the magnet in any other direction result in no magnetism. Anisotropic magnets are much stronger than isotropic magnets, which have randomly oriented magnetic domains that produce far less magnetism. Isotropic magnets do, however, have the advantage that they can be magnetized in any direction.