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

Personal Author(s) : Wun-Fogle, Marilyn ; Clark, Arthur E ; Hathaway, Kristl B

Report Date : 08 Dec 1992

Pagination or Media Count : 4

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.

Descriptors :   *PATENTS, *STRAIN GAGES, *MAGNETIC PROPERTIES, LAYERS, MAGNETIC FIELDS, MAGNETIC MOMENTS, RESISTANCE, FERROMAGNETIC MATERIALS, STRESS STRAIN RELATIONS, MAGNETOSTRICTION, MAGNETORESISTANCE, COPPER, COBALT

Subject Categories : Test Facilities, Equipment and Methods
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE