Setting bias currents and limiting corrosion in TMR sensors
US10964350B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2019 |
| Grant date | Mar 30, 2021 |
| Priority date | — |
| Expiry date | Jul 9, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3909
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method includes determining whether a tunneling magnetoresistance (TMR) sensor is corroded using resistance, amplitude and signal to noise ratio (SNR) measurements of the sensor. A method to determine whether a TMR sensor is corroded includes determining an expected initial resistance value, RTMRoUse and measuring a resistance value, RTMR, of the sensor. The method includes calculating a ratio of the RTMR value and the expected initial resistance value, RTMRoUse and determining whether the ratio is in a predefined range for the TMR sensor. In response to determining that the ratio of the sensor is within the predefined range, the method includes outputting an indication that the TMR sensor is corroded. In response to determining that the ratio of the sensor is outside the predefined range, the method includes outputting an indication that the TMR sensor is not corroded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.