Write head designs with sandwich trailing shield (STS) for high data rate perpendicular recording

A perpendicular magnetic recording (PMR) writer, comprising:

• (a) a main pole with a leading side and a trailing side at an air bearing surface (ABS), and two sides that connect the leading side and trailing side and are formed equidistant from a center plane that is orthogonal to the ABS, the leading side adjoins a lead gap at the ABS and the trailing side adjoins a write gap at the ABS;
• (b) a gap layer surrounding the main pole, the gap layer includes the lead gap, the write gap having a bottom surface at a first plane at the ABS and a first cross-track width between two sides, and a first side gap which contacts one of the main pole sides on a first side of the center plane, and a second side gap that contacts the other of the main pole sides on a second side of the center plane;
• and
• (c) an all wrap around (AWA) shield structure, comprising:
• (1) a hot seed layer having a saturation magnetic moment (Ms) in a range of 19-24 kiloGauss (kG) adjoining a top surface of the write gap, and having the first cross-track width between two sides that are equidistant from the center plane, the hot seed magnetic layer extends from the ABS to a backside that is a first height from the ABS;
• (2) a first trailing shield (TS) layer with a Ms in a range of 16-24 kG and having a first down-track thickness (t1) at the ABS, and a bottom surface with the first cross-track width between two sides formed equidistant from the center plane, and that adjoins a top surface of the hot seed layer, and extends to a backside that is at the first height from the ABS;
• (3) a second TS layer with a Ms in a range of 8-16 kG and that contacts the sides of the hot seed layer, the first TS layer, and write gap, and having a top surface formed coplanar with a top surface of the first TS layer, and with a bottom surface below the first plane;
• (4) a first side shield that adjoins the first side gap, and a second side shield that adjoins the second side gap wherein each of the first and second side shields has a first section of top surface that contacts the write gap at the first plane, and a second section of top surface that contacts the second TS layer at a variable down-track distance below the first plane;
• and
• (5) a leading shield that adjoins the leading gap, and contacts a bottom surface of each of the first and second side shields.