Produce thinner DTS and adjustable capacitance for TDMR heads
US12308052B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2023 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Jul 31, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/3996
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure generally relates to a dual free layer two dimensional magnetic recording read head. The read head comprises a first lower shield, a first sensor disposed over the first lower shield, a first upper shield disposed over the first sensor, a read separation gap (RSG) disposed on the first upper shield, a second lower shield disposed on the RSG, a second sensor disposed over the second lower shield, and a second upper shield disposed over the second sensor. In one embodiment, the RSG comprises SiO2 and has a thickness of about 7 nm to about 14 nm. The SiO2 isolates the first sensor from the second sensor, and is a chemical mechanical processing (CMP) stop layer. In another embodiment, the RSG comprises a first sublayer comprising AlOx and a second sublayer comprising SiO2. The thicknesses of the first and second sublayers are based on an adjustable capacitance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.