direction or the positive y direction as is indicated in the drawing the vertical front edges 18 a 18 b of the yokes have planar faces that are parallel to the abs of the main pole 19 and that the second taper is formed as an upward sloping beveled surface extending distally from the planar edge face 18 a to the trailing surface of the top yoke and from the planar edge face 18 b of the bottom yoke 17 b downward to the leading surface of the bottom yoke note again that the taper of the top yoke slopes upward from edge 18 b towards its trailing surface whereas the taper of the bottom yoke 17 b slopes downward towards its leading edge the faces of these edges 18 a 18 b are formed distally to the back edge 21 of the main pole taper and are recessed from the pole tip abs 19 by an amount between approximately 0 3 and 1 0 microns thus there is a short exposed flat portion 23 of the top and bottom surfaces of the main pole between the back edge of the 1 st taper 21 of the pole and the front edge of the 2 nd taper 18 a 18 b of the yokes the height of the vertical faces of the front edges 18 a 18 b is between approximately 0 and 0 2 microns the increasing thickness of the second taper in.