Accession Number:

ADD015672

Title:

Magnetic Multilayer Strain Gage.

Descriptive Note:

Patent, Filed 1 Nov 91, patented 8 Dec 92,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1992-12-08

Pagination or Media Count:

4.0

Abstract:

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.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE