Magnetic flux guiding device with antiferromagnetically coupled (AFC) oscillator in assisted writing application
US10490216B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2018 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Dec 4, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C11/1675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spin torque transfer (STO) assisted magnetic recording structure is disclosed wherein a STO device has capability to generate a radio frequency (RF) field on a magnetic bit to lower the required write field during a write process. The STO device contains a field generation layer (FGL) with a magnetization that flips to a direction opposite to the write gap field when a current of sufficient current density is applied thereby increasing reluctance in the write gap and causing a larger write field output at the air bearing surface. A key feature is that a single spin polarization (SP) layer and an antiferromagnetically coupled SP layer comprised of SP1 and SP2 layers are formed on opposite sides of the FGL. SP1 magnetization is greater than SP2 magnetization. Additive torque from SP and SP2 layers on the FGL enables FGL flipping while SP1 and SP2 precessional states provide the RF field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.