Sintered & Cast Magnets
The sintering process involves compacting fine powders at high pressure in an aligning magnetic field, then sintering into solid shape. After sintering, the magnet shape is rough, and will need to be machined to achieve close tolerances. The complexity of shapes that can be thus pressed is limited.
Sintered Rare Earth magnets from NdFeB or SmCo are Anisotropic and the strongest magnets on the market today.