Effect of Nb and Cr incorporation on the structural and magnetic properties of rapidly quenched FeCoSiB microwires |
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| Authors: | Partha Sarkar RK Roy A Mitra AK Panda Margarita Churyukanova Sergey Kaloshkin |
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| Institution: | 1. NDE & Magnetic Materials Group, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;2. National University of Science and Technology, MISIS, Leninsky Prospect, 4, Moscow 119049, Russia |
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| Abstract: | Rapidly quenched microwires with a nominal composition of Fe39Co39Si8B14 (#AO), Fe37Co37Nb4Si8B14 (#AN) and Fe36Co36Nb4Cr2Si8B14 (#ANC) have been investigated. Devitrification of as-quenched microwires showed that crystallization temperatures increased with simultaneous incorporation of Nb and Cr as in #ANC alloy. Addition of these elements also contributed to an increase in activation energy in #AN and #ANC alloys. Nb addition reduced the particle size, which became much finer in the case of the Cr-containing alloy. Although Nb addition did not have much effect on lowering the Curie temperature TC of the amorphous phase, Cr substitution lowered TC to 698 K from high values of 785 K and 787 K observed in the #AO and #ANC alloys, respectively. However, the Cr addition revealed a better Giant magneto-impedance (GMI) response compared to the other alloys. Such improved GMI properties in the Cr-containing alloy are attributed to lower values of the coercivity and magnetostriction in the alloy containing both Nb and Cr. |
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| Keywords: | Giant magneto-impedance Rapidly quenched Amorphous wire Crystallization Curie temperature |
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