Servo write heads

摘要

Multiple servo write heads (300) are fabricated as a batch from one or more ferrite wafers (400). A rounded leading edge (320) on the head creates an air bearing to reduce wear of the tape and of the head. The servo write head may have substantially planar head surface (330). A rounded trailing edge (350) may be disposed adjacent to the head surface such that the tape passes over the trailing edge after passing over the head surface. The head may be formed from an upper ferrite wafer (400) having a non-magnetic spacer. Non-magnetic material is photolithographically defined to produce gaps above the spacer. The non-magnetic material forms a region where the field loops out to intersect the passing tape, thereby transferring a magnetic pattern to tape. Additionally, a lower ferrite wafer (800) may be mated to the upper ferrite wafer (400) to complete a magnetic circuit around the gaps. The upper or lower ferrite wafer may have a channel through which an inductive winding passes.