Phase detection of spin torque oscillator reader excited through parametric excitation
US9030783B1 · kind B1 · utility
6Cited by
17References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2014 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Feb 6, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N50/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The embodiments disclosed generally relate to a read device in a magnetic recording head. The read device uses parametric excitation to injection lock the STO to an external AC signal with a frequency that is two times the resonance frequency, or more. The field from the media acting on the STO causes a change in the phase between the STO output and the external locking signal, which can be monitored using a phase detection circuit. The injection locking improves the STO signal to noise ratio and simplifies the detection circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.