Magnetostrictive bimagnetic trilayer ribbons for temperature sensing

P. MENDOZA ZÉLIS, F. SÁNCHEZ Y M. VÁZQUEZ

JOURNAL OF APPLIED PHYSICS

American Institute of Physics

Año: 2007 vol. 101 p. 345071 - 345076

0021-8979

A magnetic biphase trilayer ribbon, consisting of a melt-spun FeSiB inner amorphous ribbon with positive magnetostriction coated by two electroplated nickel layers with negative magnetostriction, is here proposed as an element to be incorporated in temperature sensor devices. The inductance of a small coil wounded around the trilayer is characterized as the sensitive parameter. The dependence of coil?s inductance on the thickness of electroplated Ni has been evaluated in the range of measuring temperatures of 0?70 °C, and optimum electroplating parameters were determined. Magnetic characteristics are determined through the study of hysteresis loops, which denote the presence of the two magnetic phases. The experimental results are interpreted considering a simple magnetoelastic model taking into account the mechanical stresses arising from the different thermal expansion coefficients of each magnetic phase.