Magnetic pre-conditioning of magnetic sensors
US9543067B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2013 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | Jan 18, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/315
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods, systems and apparatus are provided to apply a magnetic pre-conditioning to magnetic tunneling junction (MTJ) sensors and other micro-magnetic devices after fabrication but before testing, trimming or other subsequent processing. The fabricated sensor device is passed through a magnetic field that has a known direction and orientation relative to the device so that the device is placed into a known state prior to final testing and trimming. Various embodiments allow the field to be applied in situ by a permanent magnet or electromagnet as the devices are being processed by a conventional device handler or similar processing system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.