Perpendicular magnetic recording (PMR) write head with hybrid side shield
US9653101B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2016 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Oct 3, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3169
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording (PMR) writer is disclosed wherein a hybrid side shield (hSS) has an inner 15-24 kG hot seed layer formed between a gap layer and an outer hSS layer to improve tracks per inch capability while maintaining acceptable adjacent track interference (ATI). The outer hSS layer has a magnetization saturation (Ms) value from 10-19 kG and less than that of the inner hot seed layer. The inner hot seed layer has a far side that is 100 to 500 nm from a center of the main pole and may be coplanar with the sidewalls of an overlying write gap and 19-24 kG trailing shield layer. As a result, the side shield return field is substantially improved over a full side shield made of 12-16 kG material. Meanwhile, the trailing shield return field is substantially the same to enable better area density capability (ADC).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.