High-field gradient single-pole head with an improved pole structure

摘要

Relationship between head field and pole structure in single-pole head is investigated by finite-element method calculation. The calculation reveals that regular single-pole head does show relatively large field gradient with maximum of 150 Oe/nm, which is crucial for high-resolution recording, but only for relatively large field strength. By placing an additive pole in the vicinity of main pole, the head-field gradient is improved. The new pole structure increases the gradient up to 250 Oe/nm. The large field gradient is obtained in wider range of field strength than the regular single-pole head. The calculation also shows simulated recorded transition with the large head field gradient becomes narrow.