Patent ID: 9508364
Filing Date: 2016-11-29
CPC Classification: G11B

Claim Text:
1. A perpendicular magnetic recording (PMR) writer, comprising: (a) a main pole with a leading side and a trailing side, the leading side adjoins a lead gap at an air bearing surface (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, and a side gap which contacts a side of the main pole formed between the trailing side and leading side on each side of a center plane that bisects the main pole in a direction orthogonal to the ABS; and (c) an all wrap around (AWA) shield structure wherein one or more of a leading shield, side shields, and trailing shield have a composite structure, comprising: (1) a hot seed layer made of a >19 to 24 kG material having a first side that faces the main pole and adjoins the gap layer, and a second side that is opposite the first side; (2) a high damping (HD) magnetic layer made of a 10-16 kG material in the side shields and leading shield, and a 16-19 kG material in the trailing shield, the HD magnetic layer has a Gilbert damping parameter α>0.04 and a first side that adjoins the second side of the hot seed layer, and has a second side that is opposite the first side of the high damping magnetic layer; and (3) a magnetic layer made of a 10-16 kG material in the side shields and leading shield, and a 16-19 kG material in the trailing shield with a first side that adjoins the second side of the high damping magnetic layer.