Magnetic Multilayer Strain Gage.
Patent, Filed 1 Nov 91, patented 8 Dec 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A strain gauge comprised of a magnetic multilayer assembly exhibiting spin-valve effect with individual ferromagnetic layers possessing magnetostrictive properties. A magnetic field source is used to bias the magnetic moments of the ferromagnetic layers in a given direction whereby stress applied causes previously antiferromagnetically coupled moments to be angularly realigned toward a ferromagnetic arrangement. Such realignment causes a corresponding resistance change of unexpectedly high magnitude thereby providing a highly sensitive strain gauge.
- Test Facilities, Equipment and Methods
- Electricity and Magnetism