Implementing noise based detection of spin torque oscillator power-on in microwave-assisted magnetic recording (MAMR) hard disk drives
US9099128B1 · kind B1 · utility
17Cited by
3References
20Claims
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Key dates
| Filing date | Oct 28, 2014 |
| Grant date | Aug 4, 2015 |
| Priority date | — |
| Expiry date | Oct 28, 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 noise based detection of spin-torque oscillator (STO) power on for microwave assisted magnetic recording (MAMR) hard disk drives (HDDs). A low frequency noise generated by a spin-torque oscillator, such as noise in a frequency range between 10 kHz and 100 MHz, is detected. The detected STO noise is compared to a predefined threshold to identify STO power on operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.