Abstract
We study the thermal stability of ΔE-effect and field sensitivity on the Fe67Co10Cr3Si5B15 (FCCSB) ribbons with different acid-etching time. The testing temperature (T) range is from 30 to 240 °C. For all samples, we observed a general feature of ΔE-effect increasing with magnetic field up to a saturation value. The slope of ΔE versus field, defined as field sensitivity, is positive in contrast to that of the samples without Cr, suggesting the Cr-adding can alter the lattice response to the field from shrink to expansion due to the antiferromagnetic interaction of Cr-Fe. Without acid treatment, the sample annealed at 390 °C under field of 2000 Oe yields a maximum ΔE-effect. With the additional acid treatment for 40 mins before annealing, the thermal stabilities of ΔE-effect and field sensitivity are enhanced. Cross section TEM images provide an evidence for the etching induced surface crystallization. Thus, we attribute the etching enhanced thermal stability of ΔE properties to the modification of interfacial stress. This study provides useful information for the application of FCCSB ribbons as a field sensor with anti-corrosion properties.
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