MAGNETOELASTIC PROPERTIES OF CoFeCrSiB AMORPHOUS RIBBONS - A POSSIBILITY OF THEIR APPLICATION

Jan Bydžovský - Mojmír Kollár - Peter Švec - Luděk Kraus - Vladimír Jančárik

   Magnetoelastic properties of amorphous \sample ribbons with x = 2, 3.3, 4, 6, 8 and 12 were investigated. Suitable composition of amorphous material and annealing conditions with respect to magnetoelastic efficiency and linearity of transfer characteristics and resistance to external magnetic fields in a wide strain interval up to 2000 microstrains were selected. A prototype of two-coil strain sensor based on these materials was tested at different magnetizing conditions. The obtained results show the possibility to use the stress-annealed amorphous ribbon with composition Co₆₉Fe₂Cr₇S₈B₁₄ (l_s < 0) and Co₆₇Fe₄Cr₇S₈B₁₄ (l_s > 0) as a potential sensor material for civil engineering applications.

Keywords: amorphous ribbons, strain sensors, civil engineering

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