Thin film magnetic hetsudo and its production manner

摘要

PURPOSE:To increase the lifetime of a thin film magnetic head together with improvement of the reliability by forming a vertical side wall surface and a back wall surface following the gap zero level at a lower core front part and setting the height of the back wall surface at a level lower than the height of the side wall surface or forming the back wall surface as a gentle slop surface. CONSTITUTION:The projecting side surface 2a2 of a front (tip) part is patterned approximately vertical by an extent equivalent to the track width or up in the fixed depth. Thus the highly accurate control is possible with the track width. While the etching depth of a gap termination part (back wall surface) 2a4 is set at a level less than the depth of a gap forming part (both side surfaces) 2a. Otherwise the part 2a4 is patterned in a gentle taper form. Thus the core volume is increased and therefore the magnetic saturation phenomenon can be reduced. In particular, the cross sectional area is increased for a neck part (a place immediately following a position 2C showing the zero level of the gap depth) that gives the grave influence to the magnetic saturation. Thus the occurrence of the magnetic saturation can be avoided. As a result, the reliability is improved for the recording/reproducing characteristics.