Perpendicular magnetic recording (PMR) writer with one or more spin flipping elements in the gap
US10325618B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2018 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Jul 17, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/1278
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording writer has a main pole (MP) with a write gap formed between the MP trailing side and a trailing shield, a side gap between each MP side and a side shield, and a leading gap between the MP leading side and a leading shield. A flux guiding element is formed in at least one gap and comprises an inner non-spin preserving layer adjoining the MP, a middle flux guiding layer (FGL), and an outer spin preserving layer. A key feature is that the FGL has a magnetization that may be aligned anti-parallel to a gap field during a write process when a current of sufficient magnitude is applied from the adjacent shield towards the MP thereby increasing reluctance in the gap and forcing additional flux out of the MP at the air bearing surface to enhance writability on a magnetic recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.