Structural characterization and magnetoimpedance effect in amorphous and nanocrystalline AlGe-substituted FeSiBNbCu ribbons |
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Authors: | F Shahri A Beitollahi SG Shabestari M Ghanaatshoar MM Tehranchi SM Mohseni SE Roozmeh N Wanderka F Fiorillo |
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Institution: | 1. Nanomaterial Group, Department of Metallurgy and Materials Engineering, Iran University of Science & Technology (IUST), Tehran, Iran;2. Laser Research Institute, Shahid Beheshti University, Evin, 198963113 Tehran, Iran;3. Hahn-Meitner-Institut, Berlin GmbH, Strukturforschung Abt.:SF3, Glienicker Str. 100, D-14109 Berlin, Germany;4. Istituto Elettrotecnico Nazionale Galileo Ferraris, Materials Department, Strada delle Cacce 91, Torino, 10135, Italy |
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Abstract: | Two series of rapidly solidified FINEMET (Fe73.5Si13.5B9Nb3Cu1) alloys with and without partial substitution of Al (1.5 at%)/Ge (1 at%) were prepared by melt-spinning technique. The nanocrystallization process was carried out by the heat treatment of the as-spun ribbons at 560 °C for 1 h in a vacuum furnace. X-ray diffraction (XRD), transmission electron microscopy (TEM), differential scanning calorimeter (DSC), Mössbauer spectroscopy, and magnetoimpedance (MI) measurements were conducted on the as-quenched and heat-treated alloys to investigate their structural and magnetic properties. The average crystallite sizes obtained for the heat-treated samples were in the range of 10–12 nm as confirmed by our XRD and TEM data. The ultrasoft magnetic behavior observed for the Al/Ge-substituted nanocrystalline alloys was confirmed both by our magnetic data and magnetoimpedance ratio (MIR%) results. A twofold increase in the magnitude of the MIR% (99%) was observed for the Al/Ge-substituted nanocrystalline alloy against that of the pure FINEMET alloy (∼48%) measured at 5.5 MHz. This is believed to be related to the decrease of the magnetocrystalline anisotropy as well as magnetostriction decline due to the Al substitution for Fe atoms in this nanostructured alloy. |
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Keywords: | Nanostructured material FINEMET Magnetoimpedance Soft magnetic property |
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