Magnetic flux guiding devices all around main pole design without leading shield and side shields in assisted writing applications
US10714132B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2019 |
| Grant date | Jul 14, 2020 |
| Priority date | — |
| Expiry date | Jun 25, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording writer has a main pole (MP) with a first flux guiding (FG) device in a write gap between the MP trailing side and a trailing shield, a second FG device in each side gap and adjoining a MP side, and third FG device in the leading gap and adjoining the MP leading side. At least one of a first and second non-magnetic conductive layer (NMC1 and NMC2) contacts the third FG device and second FG devices, respectively, instead of a conventional leading shield and side shield. Each FG device has a flux guiding layer (FGL) with a magnetization that flips to oppose a gap flux field when a current is applied across the respective gap thereby enhancing the MP write field. NMC1 and NMC2 allow better wear and corrosion resistance in addition to improved return field and down-track field gradient, and acceptable side shield stray field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.