Detailed study of ultra-soft magnetic properties of Fe74Cu0.8Nb2.7Si15.5B7 |
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| Authors: | S Manjura Hoque MA Hakim Umasree Dhar DK Saha Per Nordblad DP Paul |
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| Institution: | 1. Materials Science Division , Atomic Energy Centre, Bangladesh Atomic Energy Commission, 4 Kazi Nazrul Islam Avenue , P.O. Box 164, Ramna, Dhaka 1000, Bangladesh manjura_hoque@yahoo.com;3. Materials Science Division , Atomic Energy Centre, Bangladesh Atomic Energy Commission, 4 Kazi Nazrul Islam Avenue , P.O. Box 164, Ramna, Dhaka 1000, Bangladesh;4. Department of Physics , Chittagong University , Chittagong, Bangladesh;5. Solid State Physics, Department of Engineering Physics , Uppsala University , Uppsala, Sweden |
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| Abstract: | The magnetic properties of nanocrystalline Fe74Cu0.8Nb2.7Si15.5B7 alloy, which were rapidly solidified and then annealed at various temperatures between 475 and 650°C for different holding time, have been studied. Grain size, silicon content and the lattice parameter of α-Fe(Si) nanograins at the annealing temperatures were determined. Curie temperature of the amorphous phase was determined from the temperature dependence of permeability. For higher annealing temperatures and times, some Si diffused out of the α-Fe(Si) phase and formed an ordered DO3 phase of Fe3Si. This changed the overall magnetostriction and average anisotropy of the matrix, which deteriorated the magnetic softness of the material at higher annealing temperatures. Ultra-soft magnetic properties were achieved by averaging the random anisotropy via exchange interaction. Hysteresis loops for samples in as-cast and annealed conditions have also been studied. |
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| Keywords: | Fe-based alloy anisotropy annealing grain size initial permeability loss factor Fe3Si |
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