US 12,380,917 B2
Perpendicular magnetic recording writer with tunable two bias branches
Yue Liu, Fremont, CA (US); and Moris Musa Dovek, San Jose, CA (US)
Assigned to Headway Technologies, Inc., Milpitas, CA (US)
Filed by Headway Technologies, Inc., Milpitas, CA (US)
Filed on Mar. 3, 2023, as Appl. No. 18/117,135.
Prior Publication US 2024/0296860 A1, Sep. 5, 2024
Int. Cl. G11B 5/127 (2006.01); G11B 5/11 (2006.01); G11B 5/23 (2006.01); G11B 5/235 (2006.01); G11B 5/31 (2006.01)
CPC G11B 5/1278 (2013.01) [G11B 5/11 (2013.01); G11B 5/23 (2013.01); G11B 5/235 (2013.01); G11B 5/3116 (2013.01); G11B 5/315 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A perpendicular magnetic recording (PMR) write head comprising:
a main pole including a tip portion configured to be disposed at an air-bearing surface (ABS) and configured to interact with a magnetic recording medium;
a write gap (WG) disposed adjacent to the main pole;
a hot seed (HS) layer connected to the WG;
a trailing shield; and
a side shield and leading shield, wherein two tunable bias branches are formed to electrically separate the trailing shield and the side and leading shields, with a first branch forming a first electrical path between the main pole and the trailing shield, and a second branch forming a second electrical path between the main pole and the side and leading shields, wherein:
the first electrical path is formed between a first electrical contact, the trailing shield, a conducting write gap equivalent resistor, and the main pole, and a second electrical contact, and
the second electrical path is formed between the first electrical contact, a first series resistor, the side shield, a conducting side gap and leading gap equivalent resistor, the main pole, and the second electrical contact, wherein the first electrical path is disposed in parallel with the second electrical path.