Spin transfer torque oscillator (STO) with spin torque injection to a flux generating layer (FGL) from two sides
US11043234B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 2019 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | Aug 21, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spin torque reversal assisted magnetic recording (STRAMR) structure is disclosed wherein a spin torque oscillator (STO) is formed in the write gap (WG) and generates one or both of a radio frequency (RF) field on a magnetic bit to lower the required write field during a write process, and a spin torque on a field generation layer (FGL) in the STO that flips a FGL magnetization to a direction opposing the WG field thereby increasing reluctance in the WG and causing larger write field output from the main pole (MP). The FGL is between two spin preserving layers that each conduct spin polarized current from an adjoining spin polarization (SP) layer. Current is applied from the MP and trailing shield to the SP layers, and returns to a direct current source through a lead from the FGL. STO sidewalls are self-aligned to a MP tip upper portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.