STO bias control for MAMR head reliability
US9672846B1 · kind B1 · utility
15Cited by
6References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2016 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Jun 21, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The MAMR head comprises a main pole, a spin torque oscillator (STO) positioned over the main pole, and write coils coupled to the main pole. The STO generates a high frequency magnetic field on a magnetic medium. The controller is configured to supply the STO with first bias current at a first bias current level, and further supply the STO with second bias current at a second bias current level. The controller is further configured to time the second bias current to coincide with an electrical current overshoot in the write coils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.