Thin magnets

How thin can thin magnets be machined? Can less than 1mm?

Thin magnets, we usually refer to magnets with a thickness of less than 1mm. Depending on the shape, they can be thin rectangular magnets, thin square magnets, thin circular magnets, long thin magnets, and paper thin magnets. How thin can these thin magnets be made? Have you ever bought such a thin magnet?...