How fine of pitch can the teeth of a target be?
At some point, the tooth size becomes too small to generate a large enough magnetic field to allow switching. The actual size limitation is dependent upon the Hall circuit type (single versus differential), the Hall-plate spacing (of differential circuits) and extent of magnetic biasing. Typically, teeth should be no smaller than 5 mm for single-element circuits. Standard differential circuits require teeth of at least 2 mm while special fine-pitch differential circuits can accommodate smaller teeth.
