TDMR SOT read heads having recessed topological insulator materials
US12136446B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2023 |
| Grant date | Nov 5, 2024 |
| Priority date | — |
| Expiry date | Jul 26, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3912
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure generally relates to a two dimensional magnetic recording (TDMR) spin-orbit torque (SOT) read head comprising bismuth antimony (BiSb) layers. The read head comprises a lower reader comprising a first SOT stack and an upper reader comprising a second SOT stack. The first SOT stack and the second SOT stack each individually comprise a BiSb layer recessed from a media facing surface (MFS) and a free layer exposed at the MFS. The BiSb layers of each SOT stack are recessed from the MFS a distance of about 5 nm to about 20 nm, the distance being less than a length of the free layers. In one embodiment, the lower reader and the upper reader share a current path. In another embodiment, the lower reader and the upper reader have separate current paths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.