MEASUREMENTS OF MAGNETOSTRICTION AND CURIE TEMPERATURE OF Fe-B AND Fe-Mo-Cu-B SYSTEMS

Gabriel Vlasák – Tomáš Kaňúch – Peter Švec – Marcel Miglierini

   Amorphous rapidly quenched ribbons 6mm wide and 20 microns thick were prepared from Fe_100-xB_x and Fe_91-xMo₈Cu₁B_x systems for x=12-25. Dilatation measurements were performed on thermally relaxed samples. Temperature dependencies of dilatation and electrical resitivity were used to estimate the values of the Curie temperatures. The measurements indicate a difference of about 250K between the values for Fe-B and Fe-Mo-Cu-B systems. The same measurements were used to determine also the values of spontaneous volume magnetostriction at 300K. Saturation magnetostriction, volume magnetostriction, and forced volume magnetostriction were determined from direct measurements of linear magnetostrictions in parallel and perpendicular configurations.

Keywords: magnetostriction, Curie temperature, Fe-B, Fe-Mo-Cu-B, amorphous alloys

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