Strain sensitivity of highly magnetostrictive amorphous films for use in microstrain sensors

A study was conducted on the strain sensitivity of amorphous (Fe(sub 90)Co(sub 10))(sub 78)Si(sub12)B(sub 10) sputtered film to examine its potential for highly sensitive microstrain gauges. Results showed that the films had very high sensitivity to strain. It was found that the magnetic uniaxial anisotropy of the film is the key parameter which governs the strain sensitivity of the film where the induction of clear but small anisotropy is needed for achieving the high sensitivity to strain.