Implementing spin torque oscillator power-on oscillation checker for microwave-assisted magnetic recording hard disk drives
US9001444B1 · kind B1 · utility
22Cited by
8References
17Claims
0Family size
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Key dates
| Filing date | Jun 26, 2014 |
| Grant date | Apr 7, 2015 |
| Priority date | — |
| Expiry date | Jun 26, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method, apparatus, and system are provided for implementing a power-on spin-torque oscillator (STO) oscillation checker to monitor STO resistance to identify STO oscillation with microwave assisted magnetic recording (MAMR) hard disk drives (HDDs). An amplitude modulated write coil drive current is applied to the write coil in the presence of a DC bias current applied to the STO. The amplitude modulated write coil drive current modulates the STO resistance monitored using an amplifier circuit to identify STO oscillation, used to ensure stable MAMR HDD write operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.